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9. Suppose that tan(alpha)=3/4 and pi<alpha<3pi/2. Find: a)sin(2alpha), b)cos(2alpha). 10. Suppose that tan(alpha)=-3 and 3pi/2<alpha<2pi. Find:...

9. Suppose that tan(alpha)=3/4 and pi<alpha<3pi/2. Find: a)sin(2alpha), b)cos(2alpha).

10. Suppose that tan(alpha)=-3 and 3pi/2<alpha<2pi. Find: a)sin(2alpha), b)cos(2alpha).

16. Given theta is an acute angle with cos(theta)=1/4 , find the value of tan(theta/2)+tan(2theta). Hint: Find each (using half angle or double angle formulas) and add them up.

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