f(x)=-cosx+cos(90-x),若x在0到90的範圍內,求最大值和最小值

f(x)=-cosx+cos(90-x),若x在0到90的範圍內,求最大值和最小值


f(x)=-cosx+cos(90°-x)
=sinx-cosx
=√ ̄2sin(x-45°)
∵0°



y=cos(4-3x),求微分


y‘=-sin(4-3x)*(-3)=3sin(4-3x)
希望對你有所幫助



求助∫d/dx[X^tan(x^2)]dx和∫dx/(2+3X^2)


∫d/dx[X^tan(x^2)]dx =∫d[X^tan(x^2)]=X^tan(x^2)+C∫dx/(2+3X^2)=(1/2)*∫dx/(1+(√(3/2)x)^2)=(1/2)*(√(2/3))∫d(√(3/2)x)/(1+(√(3/2)x)^2)=(√6/6)*arctan(√6x/2)+C(∫dx/(1+x^2)=arctanx+C)…