What is sin 20° cos 4° + cos 20° sin 4° equal to? cos 16° sin 16° cos 24° sin 24°

In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables where both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles.

So we know this identity:



Given that α = 20° and β = 4°, the solution is:

Multiply 9 and 67. then multiply 3 with 67. lastly the answer that you got for 9x67 is to be subtracted by the answer you got for 3x67