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Trigonometric identities

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Express tan 2A in terms of tanA and hence solve for 0 < A < 180, the equation tan2AtanA = 8.

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Solution Summary

This provides an example of expressing a trigonometric function in terms of another.

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Since tan(2A) = 2tanA / (1 - (tanA)^2), then we have
tan(2A) * tanA = 8
=> 2tanA * ...

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