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OpenStudy (samigupta8):
the numerical value of sin 6°.sin 42°.sin 66°.sin 78°
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OpenStudy (anonymous):
is it sqrt(3)/8
OpenStudy (samigupta8):
no
OpenStudy (samigupta8):
answer is 1/16
OpenStudy (anonymous):
its already solved in ur book but it is done as with tans
OpenStudy (samigupta8):
of course
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OpenStudy (anonymous):
yup just iguessed it don't worry
OpenStudy (anonymous):
just group as 1/4 (2sin6sin66)*(2sin42sin78)
OpenStudy (anonymous):
now use 2sinAsinB=cos(A-B)- cos(A+B)
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