72 Answered Questions for the topic Trig Identities

Trig Identities

11/18/15

tan x / secx / csc x
simplify each of the following:    cos2 x * tan2 x + cos2 x
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Trig Identities

08/19/15

The range of a "human-cannonball" act at a circus can be modeled by the equation r=v^2/g sin2?, where r is the range in metres; v is the launch speed
The range of a "human-cannonball" act at a circus can be modeled by the equation r=v^2/g sin2θ, where r is the range in metres; v is the launch speed, in metres per second; g is the acceleration... more
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Trig Identities

04/16/15

find tan2B given sinB =-8/17 and B is in quadrant III using double angle identity
B is θ and it has to be an exact value 
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Trig Identities

04/01/15

Solving the Equation
I need help solving the following equation: log(base3)(cos2x-tanx+8)=2   I'm wondering how to do it, I keep getting stuck after I substitute in for the double angle of cos and am not sure where... more
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Trig Identities

03/30/15

How do I prove the Identity?
 (cotx-1)/(cotx+1)=(1-tanx)/(1+tanx)
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Trig Identities

03/19/15

1+sin^2(x)/cos^2(x)=2sec^2(-1)
Prove the identity
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Trig Identities

03/19/15

Sec^2(x)=4sin^2x/sin^2(2x)
prove the identity
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Trig Identities

03/19/15

Cos^3(x)+sin^3(x)/cos(x)+sin(x)=2-sin(2x)/2
prove the identity  
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Trig Identities

03/11/15

A trig question -- sine with half angle identity vs. sin (A-B)
In trying to find the value of sin 165 degrees, I get the answer (sq rt (2 - sq rt 3))/2 using 1/2 angle equality -- 30 degrees / 2 -- and (sq rt 6 - sq rt 2)/4 using 180 deg - 15 deg. Calculator... more
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03/01/15

Need help proving trig identities?
I'm having trouble proving these trig identities. Help is greatly appreciated. Thanks in advance!   1) 1- sinx/cosx = cosx/ 1+sinx 2) sin^2x = 1- cos^2x 3) sin2x/2sinx = cosx 4) cosx(1+... more
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Trig Identities Precalc

01/31/15

Prove the identity
Cos4x= 1/8 (3 + 4cos2x +cos4x)
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Trig Identities

12/05/14

use a sum or difference formula to determine the value of the trig function
Sin(-pi/12) Is this the same as finding sin( pi/12)
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Trig Identities

12/05/14

use the given information to find each value
A) cos 2t B) sin 2t C)cos (t/2) D)sin (t/2) Cos t =3/5, where 0 < t < pi/2 Sin t = -3/5,where pi < t < 3pi/2
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Trig Identities Trigonometry Trig Trig Identies

08/27/14

(x+5)^4 (3x-1)^-2 + (x+5)^3 (3x-1)^-1
no calc just trig identities please show work! thakns so much for any help!
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Trig Identities Trigonometry Trig Trig Identies

08/27/14

7cos^2 (4X) + 7sin^2 (4x)
solve with only trig identities, no calc
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Trig Identities

08/27/14

if you had cos^2(2x) would you solve for the 2x or the ^2 first with trig identities
if the problem had cos^2 (2x) would you first put in the double angle or power reduction?
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Trig Identities

03/18/14

how can i solve cos^2-sin^2=2cos-1
im not sure which identities to use and how to prove it.
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Trig Identities Math Trigonometry Simplify

12/31/13

Rationalize the denominator and simplify: cos^2x / 1 - sinx
This is for my trig class. Thanks for the help!
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Trig Identities Math Trigonometry Simplify

12/31/13

Multiply and simplify: (cscx + 1)(cscx - 1)
This is for my trig class. Thanks for the help!
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Trig Identities Precalculus Trigonometry Trig

12/12/13

2sec^x-2sec^2x sin^2x
i've done problems like this before, but i was always able to change a term to cancel out something
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Trig Identities

10/23/13

Prove that 1+sin(x)-cos(x) = 2sin(x/2)cos(x/2)+sin(x/2)
I have not managed to establish how sin(x/2) relates to cos(x)
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Trig Identities

05/16/13

prove (cosx-sinx)=1-2cosxsinx
How can you prove this?
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