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5. Prove: Tan beta sin beta + cos beta = sec beta

6. Prove: ( tan y cos^2 y + sin^2 y)/ (sin y) = cos y+sin y

7. Prove (1+tan theta)/(1-tan theta) = (sec^2+2tan theta) /(1-tan^2 theta)
9 years ago

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Steve
try using the identity

sec^2 x = 1 + tan^2 x

It should get you through most of these
9 years ago

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