Question

If sinA=1/2(x+1/x), then prove that sin3A+1/2(x^3+1/x^3)=0

Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

Take, A =sin-¹(1/2)= 30°

Now Sin (3A)= Sin (3*30°)

=Sin (90°)

=1

Just simple like that

Alternatively, if the angle is in second quadrant, A = 180–30=150°

Then, Sin(3A) =Sin( 3*150)=Sin (450°)

= Sin(450–360)

=Sin (90°)

=1