Calculus

Let f(x)=9sinx/2sinx+4cosx
Then f'(x)=________ .
The equation of the tangent line to y=f(x) at a= pi/2 can be written in the form y=mx+b where
m= _____and
b=_____

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1. doesn't look too bad as soon as you let us know whether the denominator is 2sinx or 2sinx+4cosx

(do you see how important brackets are?)

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