化简:cos150°+sin210°+cos1470°+cos(-570°)
1个回答
=-Cos30+-Sin30+Cos30+-Cos30
=(根号3+1)/2
相关问题
化简:cos150+sin210+cos1470+cos(-570)
求值[tan(-330)cos(-570)cos150sin(-420)]/[cos(-420)sin(-690)]
tan(-150°)cos(-570°)cos(-1140°)/cot(-240°)sin(-690°)
求值:sin(−150°)cos(−210°)cos(−420°)cos(−600°)sin(−1050°).
sin(-1320°)cos1470°-cos(-420°)sin(-930°)
化简sin210°tan(-120°)+cos(-240°)tan420°
(cos(-570°)cos120°sin315°)/sin(-1050°)=?
sin60°cos(-45)-sin(-420)cos(-570)
(sin@-cos@除以sin@+cos@)+(sin@+cos@除以sin@—cos@)化简出来等于多少
化简:cos83°+sin75°sin8°/cos7°-cos75°cos82°