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:
= use the identity sin2x
= (1 – cos 2x)/2
(1 – cos(4θ))dθ = (¼) (θ – ¼ sin(4θ)) ] 0π/2
The answer is D.
what about the first question 12=11
What is the equation of the curve in #11? Could you post it?
please answer it
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