Question:
Find the derivative of the following functions: Sin(x+a) /(Cosx)
Answer:
Let y = Sin(x+a) /(Cosx)
then dy/dx = [Cosx *Cos(x+a) + Sinx*Sin(x+a)]/Cos2 x
= Cos(x+a-x)/Cos2 x
= Cosx/Cos2 x
= 1/Cosx
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