if cos a=12/13 find the value of sin 3a
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Answer:
sinA =5/13
sin 3A=3 sinA-4sin³A
=3×5/13- 4×(5/13)³
=15/13- 4×125/2197
=15/13- 500/2197
=2535-500/1927
=2035/1927
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