Just remember that
tanx = sinx/cosx
On the LS, replace both tangents , add them up using a common denominator
and recall that sin^2 x + cos^2 x = 1
falls apart so nicely
Verify the identity. Justify each step. tan (thetA) + cot (thetA) = 1 / sin (thetA) cos (thetA)
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