What is simplify-cos(n(-pi)) ?

The solution to simplify-cos(n(-pi)) is -(-1)^{-n}

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simplify-cos(n(-pi))

simplify

- cos (n (- π))

- (- 1)^{- n}

Solution steps

- cos (n (- π))

Use the basic trigonometric identity:

cos (nπ) = (- 1)^{n}

= - (- 1)^{- n}

sin (2 (\frac{π}{2} - x))

cos^{2} (\frac{π}{2} - x)

(- tan (x))^{2} + 1

sin (\frac{π}{2} + y)

\frac{π sin ( nπ )}{n}

What is simplify-cos(n(-pi)) ?
The solution to simplify-cos(n(-pi)) is -(-1)^{-n}