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Which of the following expressions is equal to 1 – cos4 θ?
 

Question 8 options:

2sin2 θ – sin4 θ

sin2 θ – sin4 θ

–2sin2 θ – sin4 θ

2sin2 θ + sin4 θ

 May 22, 2020
 #1
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Use z=a+bi=|z|(cos(θ)+isin(θ))z=a+bi=|z|(cos(θ)+isin(θ)) to find the trigonometric form.

√cos2(4θ)+1(cos(arctan(−1cos(4θ)1))+isin(arctan(−1cos(4θ)1)))cos2(4θ)+1(cos(arctan(-1cos(4θ)1))+isin(arctan(-1cos(4θ)1)))

So I think number 3.

 
 May 22, 2020

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