Choose the expression which is equivalent to the given expression.
-2 sin 18° cos 18°
A) sin 36°
B) cos 9°
C) cos 36°
D) sin 9°

Name: Choose the expression which is equivalent to the given expression. -2 sin 18° cos 18° A) sin 36° B) cos 9° C) cos 36° D) sin 9°
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Question

Quizplus · Accepted Answer

The expression 2 sin 18° cos 18° is equivalent to sin(2 * 18°) due to the double angle formula for sine, which is sin(2x) = 2 sin(x) cos(x). Therefore, it simplifies to sin(36°).

Choose the Expression Which Is Equivalent to the Given Expression