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OpenStudy (anonymous):
Find the exact value by using a half-angle identity sin7pi/8
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OpenStudy (anonymous):
Any help is appreciated thanks
OpenStudy (anonymous):
(sin 7pi/8)^2=(1-cos7pi/4)/2
OpenStudy (anonymous):
the answers are -1/2sqrt1-sqrt2 1/2sqrt1-sqrt2 1/2sqrt2-sqrt2 -1/2sqrt2-sqrt2
OpenStudy (anonymous):
cos7pi/4=cospi/4=sqrt2 /2
OpenStudy (anonymous):
..so combine the two.and solve it.the ans is near to0.38
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