Question

If sinA=1/2 then find the value of 3sinA- 4sin3A

Answer 1

It is given that sin a =1/2.

then we can write sin a = perp/hypo

then we have to find

3sina-4sin3a

=3(1/2)-4(1/2)3

=3/2-6

=3-12/2

=-9/2 hence found .

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