prove cos(pi/2)=-0

Solution

prove

cos (\frac{π}{2}) = - 0

True

Solution steps

cos (\frac{π}{2}) = - 0

Manipulating left side

cos (\frac{π}{2})

Simplify

= 0

Manipulating right side

- 0

Simplify

= 0

We showed that the two sides could take the same form

\Rightarrow True

cos (x) + 1 = sin (2 x)

\frac{( sec ^{2} ( x ) )}{sec ^{2} ( x ) - 1} = csc^{2} (x)

(sin (x)) (tan (x) cos (x) - cot (x) cos (x)) = 1 - 2 cos (2 x)

sin (2 0^{\circ}) = 2 cos (1 0^{\circ}) \cdot sin (1 0^{\circ})

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