设∈(π,3π/2),∈(3π/2,2π),sinα=-5/13,cosβ=4/5,则α+β是第几象限?

设π/2 1.设π/2 设π/2 设π/2 设5π/2 设-π/2 设sina=3/5(π/2 设-π/2≤x 设3π/4 设-3π 设3π 设π/3 设a、b∈(-π/2,π/2)那么a 设集合A={x|2kπ+π/3 1.设sina=1/3,2π 设y=sinx/x^2,求f'(π/3) 设sina=-sina,a∈π/2,则tan2a=√3, 设x∈(0,2π∕3],求y=cos2x+cosx+1的值域