126 Answered Questions for the topic Cosine

Cosine Trigonometry

04/17/19

I really need hel on this problem
https://imgur.com/a/DtjZ3e8
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02/27/19

How do you use the composite properties to show that an equation is an identity?
With this equation.cos(θ-180) = -cosθ
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01/11/19

Trigonometry Question!

A weather ballon is tethered to the ground at an angle of inclination equal to 30°. The string used is 400ft long. Caleb and Elissa are at different positions on level ground in line with the... more
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07/17/18

How do I use sin, cos, tan, and their inverse functions to find missing values?
I feel rather silly asking this question on here, but I have been looking up videos on how to do the trig functions sin, cos, tan, and their inverse functions and still cannot understand. I was... more
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Cosine Math Help

07/14/18

question about cosine law
for the cosine law c^2= a^+b^2-2abcosc, is the value for c always the longest angle of the triangle, and if so, how do you know which side is the longest given only 2 sides and 1 angle?
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06/28/18

Find the exact value of sin 2θ​, cos 2θ, and tan 2θ and the quadrant in which 2θ lies. Cos θ=-20/29, θ is in quadrant III?
Thank you!
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06/06/18

Prove this identity:
prove the following identity: 2sin^2(x)/sin2(x)+cot(x)=sec(x)csc(x)   please note that the cot(x) is not with the sin2(x) as a part of the denominator. The 2sin^2(x)/sin2(x) is its own fraction.... more
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06/06/18

Prove the following identity:
prove the following identity:   2sin^2(x)/sin2(x)+cot(x)=sec(x)csc(x)
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04/16/18

write sin 72 degrees in terms of cosine
how to you turn it into cosine  
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03/02/18

See Description
One end of a wire is attached to the top of the tower and the other end to a stake in the ground that is 44’ from the base of the tower. The wire makes a 64 degree angle with the flat ground. If... more
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01/18/18

What is csc2x if tanx = -3/4 and pi/2 < x < pi
The first "<" is a one with a line under it.
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12/06/17

Application of a sinusoidal function
Suppose a sales can be modelled by the equation;   S=200+200cos[pi/6(t+2)]   where t is time in months with t=0 corresponding to January for what month are sales equal to 0?
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12/04/17

Why do the values of sin and cos follow such a pattern:
sin(0)=(√0)/2 sin(π/6)=(√1)/2 sin(π/4)=(√2)/2 sin(π/3)=(√3)/2 sin(π/2)=(√4)/2   cos(0)=(√4)/2cos(π/6)=(√3)/2cos(π/4)=(√2)/2cos(π/3)=(√1)/2cos(π/2)=(√0)/2   Why do they follow this pattern?... more
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10/27/17

what is the significance between cos(45) being equal to sqrt(0.5)
I was messing with a calculator and found that the square root of 0.5 is equal to the sine and cosine of 45. I was just wondering the correlation between the two equations.
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10/04/17

Find the values of the trigonometric functions of t
csc t = 3 and the terminal point of t is in Quadrant II.
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08/07/17

If sin(x) = 1/8 and x is in quadrant I, find the exact values of the expressions without solving for x.
If sin(x) = 1/8 and x is in quadrant I, find the exact values of the expressions without solving for x.   a) sin(2x) b) cos(2x) c) tan(2x)
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07/31/17

Sine and Cosine Problem
Hello, I am having trouble with the following problem: If A and B are both acute angles and sin(A)=6/13 and cos(B)=48/49 find the value of cos9-A)-sin(-B).  Write the answer as a simplified... more
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07/23/17

Explain how you could translate the graph of y = sin(x) to obtain y = cos(x).
If the graph of y = sin(x) is shifted __?____ units left, the graph of y = cos(x) is obtained.
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07/19/17

Trigonometry Proof
Please help me answer the following question! I'm stuck!   Prove that cos6ß + sin6ß = 1/4 + 3/4cos2ß   I've tried simplifying out the LHS into (cos2ß)3 + (sin2ß)3, but I don't know what to do... more
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Cosine Trigonometry

07/12/17

If angle w is in quadrant III and cos w =a, what is cos(w+pi)?
If angle w is in quadrant III and cos w =a, what is cos(w+pi)?
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04/10/17

if P(s) lies in the second quadrant, then (cos s) (tan s ) > 0
trigonometry
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02/27/17

Confused on steps to finding smallest positive radians
Consider the equation cos(3.14t)=-0.7. Find the smallest positive solution in radians and round your answer to 4 decimal places Consider the equation tan(3.25t)-6.6. Find the smallest positive... more
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02/27/17

Solve the equation on the interval [0,360) 2sin^2(x)+3sin(x)+1=0
As well as this one below. I'm just having trouble understanding the process and steps.     Find all the solutions in [0,2pi) sin^2(t)-cos^2(t)=0 3. Solve the equation on the interval [0,360)  ... more
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02/27/17

I'm having trouble with several questions listed below:
1. Find the exact value of cos(t/2) if sin(t) = -7/25 and pi < t < 3pi/2    2. Find all the solutions in the interval [0,360]        cos(2x)= - sqrt3/2   
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02/27/17

complete the identity: cot(t) + tan(t)=
I'm having trouble solving the above question, as well as the one below    tan20+tan10/1-tan20tan10=
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