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integral (|sin x| + |cos x|)^2 dx ; x ∈ 0,20π is equal to: ​

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\(\int\limits_0^{20\pi} \) (|sin x| + |cos x|)2 dx is equal to:

(A) 10(π + 4)

(B) 10(π + 2)

(C) 20(π - 2)

(D) 20(π + 2)

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Correct option is (D) 20(π + 2)

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