Question

Find the value of Sin (315°) + Cos (225°)​

Answer 1

sin315=sin(360-45)=-sin45

cos225=cos(270-45)=-sin45

sin315+cos225=sin45-sin45=0

Answer 2

Answer:

the answer is -√2

Step-by-step explanation:

sin 315°

=sin(360-45)°

=-sin45°

and, cos225°

=cos(270-45)°

=-sin45°

therefore, sin(315)°+cos(225)°

=-sin45°-sin45°

=-2sin45°

=-2×1/(√2)

=-√2(ans)

thanks a lot...