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Use a half-angle formula to find the exact value of sin(-pi/8)?

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  • Use a half-angle formula to find the exact value of sin(-pi/8)?


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How do you use the half angle formula for #sin ... How do you find the exact value of sinx/2, ... How do you find Tan 22.5 using the half angle formula?
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Positive: 73 %
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Positive: 70 %

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My problem requires me use half-angle formula to find exact value of ... find exact value of sin 3pi/8. Now I try using half angle formula for sine then ...
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