Given ,find the value of

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- July 5th 2010, 07:01 AMmastermin346trigonometric problem
Given ,find the value of

- July 5th 2010, 07:16 AMSoroban
hELLO, mastermin346!

We need two identities:

. .

. .

Quote:

Given: , find the value of

Therefore: .

- July 5th 2010, 07:17 AMMathelogician
tan A= tan(2*A/2)=2tan(A/2)/[1-tan^2(A/2)]=4/3.

cot A=1/tan A=3/4.