若f(x)=2tanx-sin二分之xcos二分之x分之2sin²二分之x-1,则f(12分之π)的值为
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![若f(x)=2tanx-sin二分之xcos二分之x分之2sin²二分之x-1,则f(12分之π)的值为](/uploads/image/z/7018276-4-6.jpg?t=%E8%8B%A5f%EF%BC%88x%EF%BC%89%3D2tanx-sin%E4%BA%8C%E5%88%86%E4%B9%8Bxcos%E4%BA%8C%E5%88%86%E4%B9%8Bx%E5%88%86%E4%B9%8B2sin%26sup2%3B%E4%BA%8C%E5%88%86%E4%B9%8Bx-1%2C%E5%88%99f%EF%BC%8812%E5%88%86%E4%B9%8B%CF%80%EF%BC%89%E7%9A%84%E5%80%BC%E4%B8%BA)
若f(x)=2tanx-sin二分之xcos二分之x分之2sin²二分之x-1,则f(12分之π)的值为
若f(x)=2tanx-sin二分之xcos二分之x分之2sin²二分之x-1,则f(12分之π)的值为
若f(x)=2tanx-sin二分之xcos二分之x分之2sin²二分之x-1,则f(12分之π)的值为
若f(x)=2tan x-(2sin²(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值为多少?
f(x)=2tan x-(2sin²(x/2)-1)/(sin(x/2)cos(x/2))
=2tan x-(-cos x)/((sin x)/2)
=2sin x/cos x+2cos x/sinx
=2(sin²x+cos²x)/(sinxcosx)
=2/(sin(2x)/2)
=4/sin(2x)
f(π/12)=4/sin(π/6)=4/(1/2)=8
答:f(π/12)的值为8.
若f(x)=2tan x-(2sin²(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值为多少?
f(x)=2tan x-(2sin²(x/2)-1)/(sin(x/2)cos(x/2))
=2tan x-(-cos x)/((sin x)/2)
=2sin x/cos x+2cos x/sinx
=2(sin²...
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若f(x)=2tan x-(2sin²(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值为多少?
f(x)=2tan x-(2sin²(x/2)-1)/(sin(x/2)cos(x/2))
=2tan x-(-cos x)/((sin x)/2)
=2sin x/cos x+2cos x/sinx
=2(sin²x+cos²x)/(sinxcosx)
=2/(sin(2x)/2)
=4/sin(2x)
f(π/12)=4/sin(π/6)=4/(1/2)=8
答:f(π/12)的值为8。
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