# precalculus

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Write the trigonometric expression in terms of sine and cosine, and then simplify.
cos u + sin u tan u

• precalculus -

cos u + sin u (sin u/cos u)

cos u + sin^2 u / cos u

cos^2u/cos u + sin^2 u/cos u

(cos^2 u + sin^2 u) / cos u

1/cos u

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