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Use the substitution: y 2 = t a n x to find t a n x d x . Useful formulae: (i) u 2 +

Use the substitution:y2=tanx to find tanxdx.

Useful formulae:

(i)u2+a2du=a1tan1(au)+C (ii)u2a2du=a1tanh1(au)+C

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