已知三角函数tanx=1/2 求1+shin2x?

问题描述:

已知三角函数tanx=1/2 求1+shin2x?

tanx = 1/2
sin/cos = 1/2
sin x = 1/sqrt(5),cosx = 2/sqrt(5)
sin2x = 2sinx cos x = 4/5
1+sin2x = 9/5