Question

Taking ¢ = 30° , verify that :

• sin 3¢ = 3 sin¢ - 4 sin³¢.

Answer 1

When theta = 30° , we have 3 theta = 3 × 30 = 90°.



Sin 3 Theta = Sin90° = 1


And,

3 Sin theta - 4 Sin³ theta



=> 3 Sin30° - 4 Sin³ 30°


=> [ 3 × 1/2 - 4 × (1/2)³ ]



=> ( 3/2 - 4 × 1/8 )



=> ( 3/2 - 1/2 )


=> ( 3 - 1 ) /2


=> 2/2


=> 1


Therefore,


Sin 3Theta = 3 Sin theta - 4 Sin³ theta..

Answer 2

Step-by-step explanation:

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