Объяснение:
(tg²120+ctg²135)²-sin²30=
=((-√3)²+(-1)²)²-(1/2)²=(3+1)²-1/4=4²-1/4=
=16-1/4=64/4-1/4=63/4=15 3/4=15,75
ctg²120+cos²45-sin²150=
=(-1/√3)²+(√2/2)²-(1/2)²=1/3+2/4-1/4=7/12
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Объяснение:
(tg²120+ctg²135)²-sin²30=
=((-√3)²+(-1)²)²-(1/2)²=(3+1)²-1/4=4²-1/4=
=16-1/4=64/4-1/4=63/4=15 3/4=15,75
ctg²120+cos²45-sin²150=
=(-1/√3)²+(√2/2)²-(1/2)²=1/3+2/4-1/4=7/12