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
+773 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.
