2sin^225/4π+tan^2(-11/3π)*cot(-7/4π)
问题描述：
2sin^225/4π+tan^2(-11/3π)*cot(-7/4π)
答
2sin^225/4π+tan^2(-11/3π)*cot(-7/4π)
=2sin(π/4)^2+tan(π/3)^2*cot(π/4)^2
=1+3
=4