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Question

The expression tanA1cotA+cotA1tanA can be written as:

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Solution

tanA1cotA+cotA1tanAsinAcosA1cosAsinA+cosAsinA1sinAcosAsin2AcosA(sinAcosA)+cos2AsinA(sinAcosA)sin3Acos3AsinAcosA(sinAcosA)(1+sinAcosA)sinAcosA1sinA.cosA+sinAcosAsinAcosAsecAcosecA+1

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