Question
Asked Sep 9, 2019
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Simplify the following showing steps:

 

Cos4(theta)-Sin4(theta)

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Expert Answer

Step 1

Given,

...
cos (e) sin (0)
(cos (0)-(sin (0)
- (cos (e)+ sin (0)(cos (e)- stn (0)
= 1(cos2 (e)- sin2 (0)
(a2 b2 (ab) (a - b))
(cos2 (e)sin2 (0)
1)
=
=
(a2 b2(ab) (a - b))
cos2 (0) sin2 (e)
- (cosesin e ) (cose - sin0)
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cos (e) sin (0) (cos (0)-(sin (0) - (cos (e)+ sin (0)(cos (e)- stn (0) = 1(cos2 (e)- sin2 (0) (a2 b2 (ab) (a - b)) (cos2 (e)sin2 (0) 1) = = (a2 b2(ab) (a - b)) cos2 (0) sin2 (e) - (cosesin e ) (cose - sin0)

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