SOLUTION: Can you helo please; if cos a =m find sin(a-pi/2)

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Question 977431: Can you helo please; if cos a =m find sin(a-pi/2)
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
By identity,
sin%28x-pi%2F2%29=-cos%28x%29
So,
sin%28a-pi%2F2%29=-m