Question

The value of $\sin {50}^o-\sin {70}^o+\sin {10}^o$ is

• A. $1$
• B. $2$
• C. $-1$
• D. $0$

Answer 1

The correct option is D $0$

$\to {\sin 50}^0-{\sin 70}^0+{\sin 10}^0$

$\to \sin (60-10)-\sin (60+10)+\sin 10$

$\to 2{\cos 60}^0\sin (-10)+\sin 10$

$\to 0$