I need full solutions on how to do 6 a and b, please help me! I don't know how to differentiate them.
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b. the derivative is $\displaystyle cosx+sinx$ so the slope is $\displaystyle cos(\frac{\pi}{2})+sin(\frac{\pi}{2})=0+1=1$ and the y coordinate is 1. so the equation is mx+b or $\displaystyle f(x)=(1)x+1=x+1$
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