Without using calculator/table prove that $\sin 10^\… |

Q7Long8 marks2022 · Annual

Question

\sin 10^\circ \sin 30^\circ \sin 50^\circ \sin 70^\circ = \frac{1}{16}\text{.}

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8.3 Exercise 8.3

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