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Popular >

simplify cos^2(90+a)

Solution

simplify

cos^{2} (9 0^{\circ} + a)

Solution

sin^{2} (a)

Solution steps

cos^{2} (9 0^{\circ} + a)

Rewrite using trig identities

= (- sin (a))^{2}

Apply exponent rule:

(- a)^{n} = a^{n},

if

n

is even

(- sin (a))^{2} = sin^{2} (a)

= sin^{2} (a)

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Frequently Asked Questions (FAQ)

What is cos^2(90+a) ?
The solution to cos^2(90+a) is sin^2(a)