Q.

Using the formula, sin(A – B) = sinA cosB – cosA sinB, find the value of sin 15º.

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a

3-12

b

122

c

322

d

3-122

answer is B.

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Detailed Solution

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Let A = 45º and B = 30º. 

Then A – B = 15º. 

Putting A = 45º and B = 30º in the given formula, we get:

sin(45º – 30º) = sin45º cos30º – cos45º sin30º

sin(45º – 30º) =12×32-12×12=3-122

Hence, sin15°=3-122

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