True or False trig question!!?

sin(theta minus pie over 2) equals cos thetaTrue or False trig question!!?
ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm鈥?this is math right? cause ill say TRUETrue or False trig question!!?
True
true
Sin(A - 90) = Sin(A).Cos(90) - Cos(A).Sin(90)





As Cos(90) = 0 and Sin(90) = 1





then





Sin(A-90) = -Cos(A)





so it is False

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