What is the Formula of 2 Sin A Sin B ?

Solution :

The formula of 2 sin A sin B is cos (A – B) – cos (A + B).

Example : Solve : 2 sin 75 sin 15.

Solution : We have,

2 sin 75 sin 15 = cos (75 – 15) – cos (75 + 15)

= cos 60 – cos 90

= \(1\over 2\) – 0

= \(1\over 2\)


Similar Formulas

What is the Formula of 2 Cos A Sin B ?

What is the Formula of 2 Cos A Cos B ?

What is the Formula of 2 Sin A Cos B ?

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