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tan(x) = sin(x)/cos(x)

Therefore, all trigonometric ratios can be expressed in terms of sin and cos. So the identity can be rewritten in terms of sin and cos.

Then there are only two "tools":

sin^2(x) + cos^2(x) = 1

and sin(x) = cos(pi/2 - x)

Suitable use of these will enable you to prove the identity.

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