По формулам приведениям найдите значение выражения:
1)sin 150 °
2)cos 225 °
3)cos 300 °
4)sin (-120 °)
1)sin 150 °
2)cos 225 °
3)cos 300 °
4)sin (-120 °)
More Questions From This User See All
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Verified answer
1)sin 150 °=sin(180°-30°)=sin30°=½2)cos 225 °=cos(180°+45°)=-cos45°= - ✓2 /2
3)cos 300 °=cos(360°-60°)=cos 60°=½
4)sin (-120 °)=-sin120°=-sin(90°+30°)=-cos30°= - ✓3 /2