Sin 4 B +sin 10 B + sin 22 B + sin 16B

Question

Sin 4 B +sin 10 B + sin 22 B + sin 16B

Answer 1

=2sin((16b+10b)/2)cos((16b-10b)/2)+2sin((22b+4b)/2)cos((22b-4b)/2)=2sin13b*cos3b+2sin13b*cos9b=2sin13b(cos3b+cos9b)

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