Prove the identity:

23.) (tan3x - tanx)/(1 + tan3xtanx) = 2tanx/(1-tan^2 x) <--- tan squared

elp!!!

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- September 2nd 2006, 09:13 PM^_^Engineer_Adam^_^Identity problem: dont understand Tan3x
Prove the identity:

23.) (tan3x - tanx)/(1 + tan3xtanx) = 2tanx/(1-tan^2 x) <--- tan squared

elp!!! - September 2nd 2006, 09:40 PMRandom333Quote:

Originally Posted by**^_^Engineer_Adam^_^**

Use the trig identity:

Use the trig identity:

- September 2nd 2006, 10:32 PMSoroban
Hello, ^_^Engineer_Adam^_^!

We also can do it "the long way" . . .

We're expected to know that: .

Quote:

Prove the identity:

The left side is: .

Multiply top and bottom by

. .

We have: .

Factor: .