Chapter 8 · Question 3

Write the values of $\sin 30^\circ$ , $\cos 60^\circ$ , $\tan 45^\circ$ , and $\sec 60^\circ$ .

Answer

\sin30^\circ=\frac12

,

\cos60^\circ=\frac12

,

\tan45^\circ=1

, and

\sec60^\circ=2

.

These are standard trigonometric values from the NCERT table.

From standard trigonometric ratios:

\sin30^\circ=\frac12

;

\cos60^\circ=\frac12

;

\tan45^\circ=1

; and since

\sec\theta=\frac1{\cos\theta}

,

\sec60^\circ=2

.

$\sin30^\circ=\frac12$ , $\cos60^\circ=\frac12$ , $\tan45^\circ=1$ , and $\sec60^\circ=2$ .