SOLUTION: If cos(t)=-3/4 where pi<t<3pi/2, find the values of the following trigonometric functions. Note: Give exact answers, do not use decimal numbers. The answer should be a fraction

Algebra ->  Trigonometry-basics -> SOLUTION: If cos(t)=-3/4 where pi<t<3pi/2, find the values of the following trigonometric functions. Note: Give exact answers, do not use decimal numbers. The answer should be a fraction       Log On


   

Question 665802: If cos(t)=-3/4 where pi Note: 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).
cos(2t)=
sin(2t)=
cos(t/2)=
sin(t/2)=
I need HELP! Not even sure how to even start the problem.
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
If cos(t)=-3/4 where pi Note: 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).
cos(2t)=
sin(2t)=
cos(t/2)=
sin(t/2)=
===============
Look up "half-angle formula" on Wikipedia. It has the double angles also.