sin(x-20°)+cos(x+70°)+sin(x+20°)sec(70-x)=?
f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值
sin(x) cos(x) tan(x) cot(x) sec(x) csc(x) arcsin(x) arccos(x
f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值答对马上采纳,
证明(tan^2x-cot^2x)/(sin^2x-cos^2x)=sec^2x+csc^2x
证明(tan^2x-cot^2x)/(sin^2x+cos^2x)=sec^2x+csc^2x
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简
如果y=|sin x+cos x+tan x+cot x+sec x+cscx| 那么y的最小值是多少?
在三角函数中 sec x和sin x,cos x,tan x分别有什么关系?
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
sin(-x)=sin(x),cos(-x)=-cosx对吗?
化简sin(x-25°)sin(65°-x)+cos(x-25°)cos(65°-x)的结果为