Posted by **Stumped Student** on Saturday, September 22, 2007 at 9:38pm.

If cos(t)=–7/9, find the values of the following trigonometric functions.

Note: Give exact answers, do not use decimal numbers. The answer should be a fraction or an arithmetic expression.

a) cos (2t)

b) sin (2t)

c) cos(1/2)

d) sin (1/2)

i don't even know what this question is asking me to find!

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