Question

$\sin 20°=\cos ....°$, Fill in the blank.

Answer 1

Given $\sin 20°=\cos ....°$

To find the number

We know that $\sin \theta =\cos (90°-\theta )$

Consider $$\begin{gathered} \sin 20°=\mathrm{co}s(90°-20°) \\ =\cos 70° \end{gathered}$$

Hence, $\sin 20°=\cos ....°$ is $\sin 20°=\cos 70°$