f(cosx)≥0解为[0,π/2]求f(sinx)≥0解
问题描述:
f(cosx)≥0解为[0,π/2]求f(sinx)≥0解
答
f(sinx)=f(cos(π/2-x)))≥0
所以π/2-x属于[0,π/2] x属于[0,π/2]
看懂了吗?