60 Answered Questions for the topic Identities

Identities Trigonometry Trig

15d

Use identities to rewrite (sec2 x−1)(cot x)/ tan x sin x+cos x in terms of sin x and cos x. Then simplify so that no quotients appear.

I don't understand how to figure out which identity to use

15d

Use identities to rewrite tan^2 x(1 + cot^2 x) in terms of sin x and cos x. Then simplify so that no quotients appear.

My way of going about this was to use the double angle identity for tangent but there's 3 formulas for it.tan2x =2tanx/1-tan2 x =2cotx/cot2 x-1= 2/cot x – tan xI don't understand how to figure out... more
Identities Precalculus Trig

02/05/21

If sec ( x ) = 15 11 (in Quadrant-I), find cos ( 2 x ) =

Identities Precalculus Trig Sin

02/04/21

If cos α = 0.923 and cos β = 0.624 with both angles’ terminal rays in Quadrant-I, find the values of (a) cos ( α + β ) = (b) cos ( β − α ) =

I need to find it the the 4th decimal any help would be appreciated?

sin(x+y)-sin(x-y)=2sinycosx

I can't seem to figure out how to solve the right side of this to= sin(x+y)-sin(x-y)? Please help! Thx.
Identities Trigonometry

12/14/20

Help with proving trigonometric identities

sin Ө cot Ө cos Ө = 1 – sin2 Ө1 + cot Ө = csc Ө ( cos Ө + sin Ө )

11/08/20

Trig identities problem! Pls help

This is the given: csc (θ) = 5 and theta is in Quadrant 2,What is cot(θ) - cot(π-θ) + cot(θ-2π)?

11/03/20

Proving identities problem?

(secx)(cscx) - tanx = (1-(tan^2)x)/(2(tanx)) + (1)/((2sinx)cosx))I am helping my daughter study for exams and looked up questions online. I came across this and I can't seem to find the answers... more
Identities

03/29/20

cosx + sin 2x =0; 0 less than or equals to x less than 2pi

07/24/19

How to find tan(2x)

If cos= -4/5, and 180° < x < 270°, what is tan(2x)?

07/24/19

How to find tan(2x)

If cos= -4/5, and 180° < x < 270°, what is tan(2x)?

07/23/19

What is tan(x - pi/4)?

If sin x= 7/25, and 0 < x < pi/2, what is tan(x - pi/4)?
Identities Algebra 2

07/23/19

Can cos(A−B)=cos ⁡A−cos ⁡B?

Is it ever possible that cos(A−B)=cos ⁡A−cos ⁡B? Why or why not?
Identities Algebra 2

07/20/19

Can sin (A+B) = sin A+ sin B

Is it ever possible that sin(A+B)= sin⁡ A+sin⁡ B? If so, explain how. If not, explain why not.
Identities Algebra 2

07/19/19

Can sin(A+B)= sin⁡ A+sin⁡ B?

Is it ever possible that sin(A+B)= sin⁡ A+sin⁡ B? If so, explain how. If not, explain why not.
Identities Algebra 2

07/19/19

Can sin (A+B)= sin A+sin B?

Is it ever possible that sin(A+B)= sin⁡ A+sin⁡ B? If so, explain how. If not, explain why not.
Identities Trigonometry

04/09/19

tanx+cotx/sec^2x=cotx

how do you verify this
Identities Trigonometry

11/15/18

trigonometry question

cos^2(pi/8-1/2)Not sure how to go about solving this... is it a cofunction identity or a sum and difference? Help please! Thanks!
Identities

07/11/18

if cos(-0)=.95 find sin(pi/2-0)

Use identities to find the value of the expression
Identities

05/12/18

1/(sec(x)-1)(sec(x)+1)=cot^2(x)

verify the identity 
Identities

02/09/18

Find tan if cos = 1/2 and sin<0 can you explain step by step

I don’t kn how to use the identity in here can u help me

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