48 Answered Questions for the topic Identities

07/24/19

How to find tan(2x)
If cos= -4/5, and 180° < x < 270°, what is tan(2x)?
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07/24/19

How to find tan(2x)
If cos= -4/5, and 180° < x < 270°, what is tan(2x)?
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Expert Answers •2

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)?
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Expert Answers •1

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)?
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Expert Answers •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?
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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.
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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.
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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.
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04/09/19

tanx+cotx/sec^2x=cotx
how do you verify this
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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!
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07/11/18

if cos(-0)=.95 find sin(pi/2-0)
Use identities to find the value of the expression
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05/12/18

1/(sec(x)-1)(sec(x)+1)=cot^2(x)
verify the identity 
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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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01/30/18

Let z= tan a/2 Show sin a= 2z/1+z2
Let z= tan a/2  Show sin a= 2z/1+z2
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01/02/18

If sin∅+cos∅=√2,then evaluate:tan∅+cot∅
If Sin∅+cos∅=√2,then evaluate:tan∅+cot∅
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12/17/17

compress (x-8)squared + (x+8)squared
can u compress (x-8)squared + (x+8)squared
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11/29/17

Verify the identity
A.) sec θ−cos θ/sec θ = sin2θ B.) csc x − sin x = cos x cot x
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09/10/17

If 2x-6=2/x then (x^2)+(1/x^2)=?
Its options are a)11                             b)3                              c)9                             d)1
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07/30/17

Verifying Trig identity
Hello! I am having some trouble verifying a trig identity   sin(4x)=4cos^3(x)sin(x)-4sin^3(x)cos(x)
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04/10/17

Simplify the following trig expression
 Simplify the following trig expression : 1/1-sec x - 1/1+sec x 
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04/09/17

Suppose that cos(t)=-3/5 where t is in the third quadrant. What is cos(2t)?
Can someone walk me through each step with an explanation? please?
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03/28/17

Prove that these are identities
2cosx - secx = cosx - tanx/cscx
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12/18/16

Trig Identity - Prove Each Identity - Show All Work
prove (1 - cos2x)(1 - tan2x) = sin2x cos2x/1-sin2x   I can't seem to solve this! Halp!!!
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12/14/16

Trig Identity
Prove sin4x = 4 (sin x-2 sin^3 x)/secx   I can't seem to solve this! Halp!!!
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Expert Answers •1

11/28/16

Identity trig functions
Prove the following identity:   sec (pi/2 - x)=csc x
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