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Question #33ab5

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Dec 20, 2016

#RHS=sin7theta+sin4theta-sin2theta+sintheta#

#=(sin7theta+sintheta)+(sin4theta-sin2theta)#

#=(2sin4thetacos3theta)+(2cos3thetasintheta)#

#=2(sin4theta+sintheta)cos3theta#

#=4sin((5theta)/2)cos((3theta)/2)cos3theta=LHS#

Proved

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