sin(-480度)cos570度+cos(-300度)sin(-1050)

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：数学作业时间：2024/05/11 12:55:48

sin(-480度)cos570度+cos(-300度)sin(-1050)
急

sin(-480度)cos570度+cos(-300度)sin(-1050)
=-sin480°cos(360°+210°)+cos300°*(-sin1050°)
=-sin(360°+120°)cos210°-cos(360°-60°)sin(3*360°-30°)
=-sin120°cos(180°+30°)-cos60°(-sin30°)
=-sin(180°-60°)(-cos30°)+cos60°sin30°
=sin60°cos30°+cos60°sin30°
=sin(60°+30°)
=sin90°
=1

sin cos tan不同度的值为什么 45度的角 sin > cos sin(50度)*cos(10度)+sin(40度)*sin(10度)= sin(a+105度)cos(a-15度)-cos(a+105度)sin(a-15度) 化简：cos^(@+15度)+sin^(@-15度)+sin(@+180度)cos(@-180度) sin 45度cos 15 度－cos 45度sin 15度等于多少? sin 45度cos 15 度—cos 45度sin 15度等于多少 sin(-75度)sin(-435)cos(-15)tan(-15)cot(-15)tan(-105)cos(-105) sin a + cos a = m .求 sin a -cos a (0度< a 已知sinα+cosα=m,求sinα-cosα的值,（0度求值sin 1 3 度sin 7 3 度+cos 1 3 度sin 1 7 度分之cos 的平方1 5 度-sin 的平若sin(270度+θ)=2cos(90度+θ),则cos^2+sinθcosθ-sin^2θ的值为