Substitute pi/2 for x in the function. You can simplify (pi/2 + pi) to be = (3/2)*pi. Sine of (3/2)*pi is -1. There is an extra right parenthesis mark which will confuse the possible answers of -1 or +1 depending on whether the "(" is before the "sin" or b4 the argument: ((x + pi)/3)
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f(x) = sin (x + π)/3), x=π/2
= sin [(3π/2)/3]
= sin (π/2)
= 1
Substitute pi/2 for x in the function. You can simplify (pi/2 + pi) to be = (3/2)*pi. Sine of (3/2)*pi is -1. There is an extra right parenthesis mark which will confuse the possible answers of -1 or +1 depending on whether the "(" is before the "sin" or b4 the argument: ((x + pi)/3)