Is cos(2 pi/2)=1-2sin^2(pi/2) ?

The answer to whether cos(2 pi/2)=1-2sin^2(pi/2) is True

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prove cos(2 pi/2)=1-2sin^2(pi/2)

prove

cos (2 \frac{π}{2}) = 1 - 2 sin^{2} (\frac{π}{2})

True

Solution steps

cos (2 \cdot \frac{π}{2}) = 1 - 2 sin^{2} (\frac{π}{2})

Use the Double Angle identity:

cos (2 x) = 1 - 2 sin^{2} (x)

\Rightarrow True

cos (x) - cos^{3} (x) = cos (x) - sin^{2} (x)

cos (- \frac{π}{2} + θ) = sin (θ)

(cos (- sec (x)))^{2} = tan^{2} (- sin^{2} (x))

cos (B) csc (B) tan (B) = 11

tan (8 x) = \frac{8 tan ( x )}{1 - tan ^{2} ( x )}

Is cos(2 pi/2)=1-2sin^2(pi/2) ?
The answer to whether cos(2 pi/2)=1-2sin^2(pi/2) is True