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The expresion sin(x) is equivalent to sin (pi - x) because we can see from the sin of a subtraction of angles that:
sin(A-B) = sin(a) cos(B) - sin(B) cos(A)
in our case:
sin(pi - x) = sin(pi) cos(x) - sin(x) cos(pi)
since sin(pi) = 0 , the the first term above becomes a zero. And since cos(pi) = "-1", then the second term becomes -sin(x) times (-1) = sin(x)
sin(pi - x) = sin(pi) cos(x) - sin(x) cos(pi) = 0 - sin(x) * (-1) = sin(x)
Therefore, please select the third answer in your list of options.