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Which is equal to sin30 \sin 30^\circ ? \newlineChoices:\newline(A) cos60 \cos 60^\circ \newline(B) cos30 \cos 30^\circ \newline(C) sin60 \sin 60^\circ \newline(D) sin30 \sin 30^\circ

Full solution

Q. Which is equal to sin30 \sin 30^\circ ? \newlineChoices:\newline(A) cos60 \cos 60^\circ \newline(B) cos30 \cos 30^\circ \newline(C) sin60 \sin 60^\circ \newline(D) sin30 \sin 30^\circ
  1. Use of sin30°\sin 30°: sin30°\sin 30° is known to be equal to 12\frac{1}{2}.
  2. Use of cos60°\cos60°: cos60°\cos60° is also known to be equal to 12\frac{1}{2}.
  3. Equality of sin30\sin 30^\circ and cos60\cos 60^\circ: Therefore, sin30\sin 30^\circ is equal to cos60\cos 60^\circ.

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