Question

What is the value of Sin (-1125)?

Answer 1

Answer:

$\text{The value of sin(-1125) is }\frac{1}{\sqrt2}$

Step-by-step explanation:

We have to find the value of sin(-1125)

As, $\sin (-A)=-\sin A$

$\sin (-1125)= -\sin (1125)$

                 $=-\sin (1080+45)$

                $=-\sin (3\times360+45)$

                $=-\sin 45=\frac{1}{\sqrt2}$

Rationalizing, we get  

$\sin (-1125)=-\sin 45=\frac{\sqrt2}{2}$

Hence,

$\text{The value of sin(-1125) is }\frac{\sqrt2}{2}$

Answer 2

Answer:

-1/√2

Step-by-step explanation:

sin(-1125°)= -sin(1125°)

= -sin(1080+45°)

= -sin45°                    (Фlies in first quadrant i.e.is sinФ is + )

= -1/√2