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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!

  • CALCULUS - ,

    I will do one for you. It is asking you to apply the double and half angle formulas.

    Cos2t=sin^t -cos^2 t
    Now do you know how to get the sint, given cost?
    Use pythoregean theorm.

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