Which of the following expressions is equal to ?

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

Which of the following expressions is equal to cos⁡(α+β)\cos(\alpha+\beta)? (a) sin⁡αcos⁡β+cos⁡αsin⁡β\sin\alpha\cos\beta+\cos\alpha\sin\beta (b) cos⁡αcos⁡β−sin⁡αsin⁡β\cos\alpha\cos\beta-\sin\alpha\sin\beta (c) cos⁡αcos⁡β+sin⁡αsin⁡β\cos\alpha\cos\beta+\sin\alpha\sin\beta (d) cos⁡αcos⁡β−sin⁡αcos⁡β\cos\alpha\cos\beta-\sin\alpha\cos\beta

Related theory

Browse the problem library