Question

urgent help needed Pls help One last chance left on this question

Answer 1

To start, look at where x = 0. since y equals zero at that point as well, you can eliminate any possible choices which don't equal zero at x = 0.

x = 0:

y = sin((0) - pi/2) = sin(-pi/2) = -1, not an answer
y = -cos(0 - pi/2) = 0, possibility
y = cos(0 + pi) = 1, not an answer
y = -sin(0) = 0, possibility
y = sin(0 + pi) = 0, possibility
y = -cos(0) = -1, not an answer

Answer 2

Thank you @Gonzales

Answer 3

you can then take another point, lets say x = pi/2 to eliminate any other answers

2. y = -cos(pi/2 - pi/2) = -1, possibility
4. y = -sin(pi/2) = -1, possibility
5. y = sin(pi/2 + pi) = sqrt(3)/2, not an answer

your answers are 2 and 4