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monishnakade:
answer do salo
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tan^3 -1 = ( tan -1)( tan^2 + tan +1) = ( tan -1)( sec^2 -1 + tan +1) = ( tan -1)( sec^2 + tan)
So tan^3 -1)/ tan -1 = sec^2 + tan
So tan^3 -1)/ tan -1 = sec^2 + tan
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