Question

Helpppppppppppppppppppppp

Answer 1

For this case what you should do is evaluate the function at a point where you can find the value of and without problems.
 So we have to:
 y = sin (x + 90)
 We evaluate x = 0
 y = sin (0 + 90)
 y = 1
 Answer:
 y = sin (x + 90)
 Option A