126 Answered Questions for the topic Cosine

02/12/17

Describe a real-world phenomenon that can be modeled by one of these two trigonometric functions.
The sine and cosine functions are used to model periodic behavior. find an internet resource that discusses the periodic behavior.
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02/06/17

Find the exact value of the expression.
sin((pi)/(6))cos((pi)/(3)) - sin((pi)/(3))cos((PI)/(6))
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Cosine Angle

01/05/17

Missing angle
Find the missing angle below for 0°≤Ø≤90°   cos Ø = 1/2
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Cosine Math Help Sine

12/10/16

What's the value of x?
What's the value of x if pi≤x≤3pi/2 and sin x=5 cos x?
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12/03/16

Need to simplify
(CosA-cosB)2 + (sinA-sinB)2   Can someone help me solve this? and what steps do we take ?
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12/02/16

find the formula for maximum height and find a sin function
the path traveled by an object (neglecting air resistance) that is projected by an initial height of h0 feet, an initial velocity of v0 feet per second and an initial angle theta is given by... more
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12/01/16

simplify the expression (sinAsinB)(cosAcosB)
simply simplify the expression. i have to find out if my answer i have is right or wrong
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Cosine Function Sin

11/17/16

Sin and Cos functions
Without a calculator, find the exact value of:   a) sin(120)   b) cos(-3Π/4)
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11/11/16

Cosine function
a cosine function has an amplitude of 1/3, period of pi/3, horizontal shift of -2pi, and vertical shift of -3.  What is the y-value of the negative function when x= pi? 
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10/10/16

What are the solutions to cosine (2?)=square root 3 over 2 in the interval 0=?<2p??
 help
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08/30/16

trigonometry question
A ladder leans against a wall with its foot 1.5 metres from the wall making for an angle of 45º36' with the ground. How long is the ladder?
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Cosine Interval Tangent

07/17/16

solve tan(x/2)=sqrt3/3
solve on the interval [0,2(pie)).  The square root is just on the top 3 not the whole fraction.
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06/26/16

use version 2 of the chain rule to calculate the derivative of the following function
y=cos^4 *x+sin^4 *x
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06/24/16

Trig Angle Approximations
Angles α and β are between 0° and 360° with cos α = -0.9063 and tan β = -0.4877.Which of the following is a possible (approximate) value for α + β? A) 51° B) 129° C) 309° D) 361° E) 669°
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06/23/16

Finding the distance from ceiling to each point in the clock and finding an equation with cosine or sine
2) Clock #2: A clock has a radius of 6 inches. The center is 14.5 inches below the ceiling. Measure the distance from the ceiling to the tip of the hour hand at each hour beginning at 12 (which is... more
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05/28/16

Solve for 2cos-sin^2x=cos^2x over the interval [0,2pi)
Solve for 2cosx - sin2x= cos2x over the interval [0,2pi)   1.) x=pi/6 and 11pi/6 2.) x=5pi/6 and 7pi/6 3.) x=2pi/3 and 4pi/3 4.) x=pi/3 and 5pi/3
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05/23/16

Find the value for Cos(theta) if the following conditions hold: Cos(2theta)=1/sqrt2 and 180 degrees < 0 < 270 degrees
This is a trigonometric Identity related question.
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05/20/16

what is cos x?
If 0≤x≤90 and tan x=15/8, then cos x=?
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05/11/16

Find sin2x and cos(x/2) given that cotx= -(3/4) and cosx < 0
 Help please?
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03/17/16

Trig Vector Question, What is the ground speed of the plane?
An airplane has an airspeed of 500 kilometers per hour bearing N45°E. The wind velocity is 60 kilometers per hour in the direction N30°W. Find the resultant vector representing the path of the... more
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Cosine Sine

03/11/16

Cosine x= sine(x+20)
The question is asking to find the value of x if Cosine x = sine (x+20) 
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03/10/16

TRIGONOMETRY - functions & angles in standard position
Find the value of cos (angle) in (angle) is in standard position and the point (5,-12) is on the terminal side of (angle).  b) -5/13 c) 5/13 The correct answer is C, but I chose B. Why is the... more
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01/28/16

Trigonometric equations
if inverse cosine of x + inverse cosine of y = pi/2 show that x^2 + y^2 = 1
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01/13/16

Graphing Trig. Functions & Inverses
Evaluate In degrees:   1. Sin^-1 (-2pi)    2. arctan (- square root 3/3)   3. sin (cos^-1(- square root 3/2)      Evaluate in Radians   1. Arctan (-1)   2. cos^-1 (- 1/2) 
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01/10/16

Find an equation equivalent to x^2 - y^2 = 4 in polar coordinates.
Find an equation equivalent to x^2 - y^2 = 4 in polar coordinates.  
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