Double-angle or half-angle formula


1.Simplify the expression using the double-angle or half-angle formula

3sin (theta/8) cos (theta/8)

2. Find sin(x/2), cos(x/2) and tan (x/2) when cos is -12/13

Please explain exactly how to do these so I can learn them for the test.

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Mathematics: Double-angle or half-angle formula
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