Given and , find the exact value of .
Note: You are not allowed to use decimals in your answer. = . which then is
Where did I go wrong
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I think you first want to find from:
Since is a first quadrant angle, we have:
Next, using the double-angle identity for sine and the half-angle identity for cosine, we find:
Now solve for
Can you please give me the original formulas ? so I can better understand the substitution you have made?
Should this not be then
A couple of errors . . . . .
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