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Mathematics 11 Online
OpenStudy (samigupta8):

the numerical value of sin 6°.sin 42°.sin 66°.sin 78°

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

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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