Question

evaluate : 3sinα-4cos^3α, if sinα=1/2

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

=3 − 33√2

Step-by-step explanation:

Assuming your question as :

Find the value of 3 sin x − 4 cos3x if sin x = 12Here is the answer.We have, sin x = 12⇒sin x = sin 30°⇒x = 30°Now, 3 sin x − 4 cos3x=3 sin 30° − 4 cos330°= 3 ×12 − 4 ×(3√2)3=32 − 33√2=3 − 33√2