266 Answered Questions for the topic trigonometric identities

10/26/16

Trig question

My math is online and the helper says that sin∅= y/r= (5√74)/74 = 144.5° . how do u convert that fraction into degrees.  I did try the inverse of ∅=sin-1(y/r) , but for my example that only comes... more
Trigonometric Identities

10/20/16

sec^6(x)-tan^6(x)=1+3tan^2(x).sec^2(x)

Proved LHS is RHS
Trigonometric Identities

09/08/16

Does tan^2(x)*sin^2(x) equal to tan^2(x) - sin^2(x).

Because if you take: tan^2(x) + 1 = sec^2(x) then tan^2(x) = sec^2(x) - 1. And if we input that into the original then sec^2(x) * sin^2(x) - sin^2(x) or tan^2(x) - sin^2(x) which seems weird
Trigonometric Identities

08/26/16

what is the trig identity for negative sin squared

What is the trig identity for negative sin squared
Trigonometric Identities

07/30/16

Prove Identity: cot(x)+1/cot(x)-1=1+tan(x)/1-tan(x)

Prove from one side to another using trig identities. 
Trigonometric Identities

06/29/16

Prove that (cotx+cosecx-1)/(cotx-cosecx+1)=sinx/(1-cosx)

I need this solution urgently please......
Trigonometric Identities

06/23/16

Sin ^4x-cos^4x=1-2cos^2x

Need help proving this identity
Trigonometric Identities

06/23/16

Sin2x(cot x + tan x) =2

Prove this identity. Help me please
Trigonometric Identities

06/23/16

(Csc x)(sec x)=2csc2x

I have to prove the identity. But need help
Trigonometric Identities

06/22/16

(cos x/ 1+ sin x) + (1+sin x/cos x)= 2 sec x

How would I prove this identity  
Trigonometric Identities

06/22/16

Sin x-sin x cos ^2 x = sin^3x

I must prove the following identity. 
Trigonometric Identities

06/22/16

(1/tan x) + (tan x)= (1/ sin x cos x)

I am to prove this identity to be correct. And I don't know what side to begin with...since I started with the left and made tan into sin/cos.  
Trigonometric Identities

06/22/16

Tan x sin x + cos x= sec x

I have to prove that the identity is correct. But not quite sure how to do so. 
Trigonometric Identities

06/22/16

Simplify. Sin^2?cos^2?-cos^2?

I have to simplify that particular expression. But I thought that maybe the cos would cancel. I'm not sure what to do
Trigonometric Identities Trigonometry Pre Calculus Angles

06/14/16

Trigonometry

from the top of a building a person spots two boats out on the lake. the angle of depression from the person to one of the boats is 48 degrees, the angle of depression from the person to the other... more
Trigonometric Identities Trigonometry Trigonometry Identities

06/12/16

Can someone walk me through simplifying sec(?)?^2 * cot(?) * cos(?) =

  I thought it'd be  (1 / cos(θ)2) * (1 / tan(θ)) * (cos(θ) / 1)   Which would get you cos(θ) / cos(θ)2 * tan(θ)   And then coming out to 1 / cos(θ) * tan(θ)   but that doesn't make sense... more
Trigonometric Identities Trigonometry

06/09/16

let theta be an angle in quadrant II

Let theta be an angle in quadrant II such that cos(theta) = -4/7   Find the exact values of csc(theta) and tan(theta)
Trigonometric Identities

06/09/16

What is 1-tan^2(x)

I need to know how to simplify this expression
Trigonometric Identities Trigonometry

06/07/16

trignometry identites questions

1.Why is it necessary to prove a trigonometric identity before using the identity?2. If the identity 1+cot x=csc x is used in the proof of another identity, for what values of x is the proof... more
Trigonometric Identities

06/04/16

could some one help me out?

how can I proof that( sine alpha + cos alpha) <= 1/2, using the fact that sine (- beta) and cos (-beta) = cos beta?
Trigonometric Identities Precalculus Math Help Identities

05/23/16

Pre cal help please ! Answer asap! Thanks!

prove the following identity.   1-cosθ/sin2θ = 1/1+cosθ   thanks!
Trigonometric Identities Cosine Theta

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.
Trigonometric Identities

05/09/16

trigonometric identities

i need help solving trigonometric identities
Trigonometric Identities Trigonometry Math Help Alegbra 2

05/02/16

Find the exact value of tangent for the angle in standard position with the terminal side located at A.

A) -1 B) 1  C) 0 D) undefined E) none of these
Trigonometric Identities Trigonometry Math Help Alegbra 2

05/01/16

Find sin theta if tan theta = sqrt3 / 3, and falls in quadrant 2

Answer choices: A) sin theta = -1/2 B) sin theta = 1/2 C) sin theta = sqrt3/2 D) sin theta = - sqrt3/2

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