Without using calculator, prove that $\cos 10^\circ… |

Q4Long8 marks2023 · Annual

Question

\cos 10^\circ \cdot \cos 30^\circ \cos 50^\circ \cdot \cos 70^\circ = \frac{3}{16}\text{.}

Your answer

Sign in to write or photograph your own answer before checking the model answer. It is saved privately to your account and free to do.

Opening this question and recording your study progress…

Practice linked to this question

Flashcards, MCQs and other questions linked to this one appear here as they are added.

Topics and outcomes this question is testing.

Express the product (of sines and cosines) as sums or differences (of sines and cosines).