f(x)=-cosx+cos(90-x),若x在0到90的范围内,求最大值和最小值

问题描述:

f(x)=-cosx+cos(90-x),若x在0到90的范围内,求最大值和最小值

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