Question

simplify: sin[(3pi over 2)+x)]

Answer 1

Use the sum of angles identity for sine:
sin(a+b) = (sin a)(cos b) + (cos a)(sin b)

sin(3π/2+x) = (sin 3π/2)(cos x) + (cos 3π/2)(sin x)
= (-1)(cos x) + (0)(sin x)
= -cos x

Answer 2

what they said ^^

Answer 3

thank you :)

Answer 4

@camjan Welcome:)

Answer 5

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Answer 6

@camjan yeah, sure:)