Re: [微積] 積分一題
※ 引述《tetsukaii (tetsukaii)》之銘言:
: 題目:
: r^2=4cos2θ 之面積
: 我遇到這題目不知所措
: 要從哪裡下手?
: 麻煩大家,謝謝
-π/4 <= θ <= π/4
3π/4 <= θ <= 5π/4
π/4
A = 2∫(1/2)(4 cos2θ) dθ
-π/4
π/4
= 2 sin(2θ)[
-π/4
= 4
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04/16 11:23, , 1F
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