Please help:

4) sin-1 (square root of 5 over 3)

5) cot pie over 12

6) sint= 1/4. 0<t< pie over 2 and sin t is given.

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- Apr 27th 2009, 07:27 PMdonnyBSome trig questions part 2
Please help:

4) sin-1 (square root of 5 over 3)

5) cot pie over 12

6) sint= 1/4. 0<t< pie over 2 and sin t is given. - Apr 27th 2009, 08:53 PMSengNee
4) sin-1 (square root of 5 over 3)

Do you mean $\displaystyle \sin^{-1}(\frac{\surd5}{3})$

5) cot pie over 12

You should find $\displaystyle \tan\frac{\pi}{12}$ 1st, then find its reciprocal.

You can you your scientific calculator

or

$\displaystyle \tan\frac{\pi}{6} =\frac{2\tan\frac{\pi}{12}}{1-\tan\frac{\pi}{12}}$ where $\displaystyle \frac{\pi}{6}$ is a special angle.

6) sint= 1/4. 0<t< pie over 2 and sin t is given.

That means it is in the 1st quadrant.