None of the Problems can contain a Trig Identity...

cos(t)=-5/6

pi<t< 3pi/t

Give exact answers, do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2).

Unknowns:

Sin(2t)=?

Cos(t/2)=?

sin(t/2)=?