化简 sin(x-20°)+cos(x+70°)+sin(x+20°)sec(70°-x)
化简sin(x-25°)sin(65°-x)+cos(x-25°)cos(65°-x)的结果为
化简cos(180°+x)*sin(x+360°)/[sin(-x-180°)*cos(-180°-x)]
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简
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
求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
【三角恒等变换】cos(33°-x)sin(63°-x)-cos(x+57°)sin(27°+x)
化简cos²(-X)-【tan(360°+X)】/【sin(-X)】
在三角函数中 sec x和sin x,cos x,tan x分别有什么关系?
f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值答对马上采纳,
化简 cos^2(x)*sin^2(x)-sin^2(x)
化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x)