help to answer please???
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4sin30.cos 60 sin 90 = 4x 1 /2x 1/2x 1=1 proved just put the value it's simple ..
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Answered by
1
since B= 15
therefore 4.sin2B = 4*sin30= 4*1/2=2
cos 4B =cos 60= 1/2
sin 6B = sin 90= 1
hence answer is 2*1/2*1 =1
therefore 4.sin2B = 4*sin30= 4*1/2=2
cos 4B =cos 60= 1/2
sin 6B = sin 90= 1
hence answer is 2*1/2*1 =1
Anonymous:
can u explain how did the answer came
ok
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