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

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

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?
Positive: 73 %
Question 926994: Use half-angle formulas to find the exact values. (a) cos 67°30' (b) sin 75° (c) tan 3π/8 Answer by ... sin 75 °.. (c) ...
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 ...
Positive: 73 %
use a half angle formula to find the exact value of each expression tan 7pi/8@aum . \[\large \sin ... use a half angle formula to find the exact value of ...
Positive: 68 %
Use a sum or difference identity to find an exact value sin(15 ... 15 is half of 30 so use half angle formula ... We know the exact values of sin and ...