Question

Sin120+cos150+sin210+cos240

Answer 1

Answer:

-1

Explanation:

as quadrants sin120 is 1/2 and cos150 is-1/2 and sin 210 is-1/2 and cos240 is-1/2 total -1

Answer 2

Answer:

-1

Explanation:

sin180-60 + cos180-30 + sin 180+30 + cos 180+60

= √3/2 - √3/2 - 1/2 - 1/2

=-1