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OpenStudy (anonymous):
Use a sum or difference formula to find the exact value of the following: sin(5π/7)cos(π/21)-cos(5π/7)sin(π/21)
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OpenStudy (cwrw238):
use the identity sin (a - b) = sin a cos b - cos a sin b
OpenStudy (cwrw238):
so your expression becomes sin (5pi/7 + pi/21)
OpenStudy (cwrw238):
= sin 16pi/21
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