Prove that (1 + tanB) / (1 - tanB) = (1+ sin2B) / (cos 2B)?

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Prove that (1 + tanB) / (1 - tanB) = (1+ sin2B) / (cos 2B)?

2007-12-05 15:54:21 · 1 answers · asked by xtmilx 2 in Science & Mathematics ➔ Mathematics

1 answers

Work with the left side:

Write tanB = sinB/cosB. Multiply numerator and denominator by cosB. Then multiply numerator and denominator by (cosB + sinB). Expand both numerator and denominator. Look at the right side of the identity to help you figure out what to do next.

2007-12-05 17:42:42 · answer #1 · answered by Ron W 7 · 0⤊ 0⤋