1 If the integral A = S -dx is changed using substitution t = tan then A = ... sin x-cos x 1 Jika t = tan÷, maka nilai A untuk A dx adalah .... sin x-cos x dt t2+2t-1 1. O 1 dt t2+1 2. O 2 dt 1-2t-t² 3. О Sá dt t2+1 4. O

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