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     EduGorilla 
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    tan {1/2 sin1 ( 2x/ 1+x2) + 1/2 cos1 ( 1-y2/1 + y2)} is equal to

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    1. 1/2
    2. 1/2
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Reply To: tan {1/2 sin-1 ( 2x/ 1+x2) + 1/2 cos-1 ( 1-y2/1 + y2)} is equal to….
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