70. $y = \tan (\pi x^{2})$ 的微分


(A)$2\pi \sec^2 x$

(B)$2\pi \sec (\pi x^{2})$

(C)$2\pi x \sec^2 (\pi x^2)$

(D)$2\pi \tan^2 (\pi x^2)$

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統計： A(0), B(1), C(0), D(0), E(0) #3927279