What is expand asin((n-1) pi/2) ?

The solution to expand asin((n-1) pi/2) is -acos((pin)/2)

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expand asin((n-1) pi/2)

expand

a sin ((n - 1) \frac{π}{2})

- a cos (\frac{πn}{2})

Solution steps

a sin ((n - 1) \frac{π}{2})

Expand

(n - 1) \frac{π}{2} : \frac{π}{2} n - 1 \cdot \frac{π}{2}

= a sin (\frac{π}{2} n - 1 \cdot \frac{π}{2})

Rewrite using trig identities

= a (- cos (\frac{πn}{2}))

Remove parentheses:

(- a) = - a

= - a cos (\frac{πn}{2})

y^{2} (\frac{x}{y ^{3}} - 3)

\frac{x ^{2} + 2 x - 18}{( x + 4 ) x ^{3}}

x^{\frac{1}{3}} (x - 2)

(x + a) (x + b) - x

\frac{1}{( s - 2 ) ( s ^{2} - 2 s + 1 )}

What is expand asin((n-1) pi/2) ?
The solution to expand asin((n-1) pi/2) is -acos((pin)/2)