12. Since the graph has 5 'petals', the period of the function is 2 pi/5, and the answer is C.

13. To find the area, use the formula in polar coordinates:

A = (1/2)∫_{0}^{π/2} r^{2}(θ)dθ = (1/2)∫_{0}^{π/2} sin^{2}(2θ)dθ = use the identity sin^{2}x = (1 – cos 2x)/2

(1/4)∫_{0}^{π/2} (1 – cos(4θ))dθ = (¼) (θ – ¼ sin(4θ)) ] _{0}^{π/2 = } π/8.

The answer is D.

what about the first question 12=11

What is the equation of the curve in #11? Could you post it?

r=2(1-cos(theta))

please answer it

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