Question

simpllfy cos 100°. cos 40°+sin100°. sin40°​

Answer 1

Answer:

${\huge{\boxed{\mathbb{ANSWER}}}}\\ \cos(100°) \cos(40°) + \sin(100°) \sin(40°) \\ \cos(100° - 40°) = \cos(60°) = \frac{1}{2}$

1/2 is the right answer.

Formula used :-----

cosAcosB+sinAsinB = cos(A-B)