How do I solve:

Using Double angle identities

1. Find tan2x when secx = sq.root(65); sin x > 0

Using Pythagorean identities

1. [(1+ cot^3 x) / ( 1 + cot x)] + cot x = csc^2 x

Thank you very much for your time! =)

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- Apr 5th 2009, 01:15 AMcoolacuHelp with solving these Trig Identities... Part 2
How do I solve:

__Using Double angle identities__

1. Find tan2x when secx = sq.root(65); sin x > 0

__Using Pythagorean identities__

1. [(1+ cot^3 x) / ( 1 + cot x)] + cot x = csc^2 x

Thank you very much for your time! =) - Apr 5th 2009, 06:32 AMSoroban
Hello, coolacu!

Quote:

Using Double angle identities

We are given: .

From Pythagorus, we have: .

Hence: .

Substitute into [1]: .

Quote:

Using Pythagorean identities