计算sin^2 (π/4)-cos^2 (π/4) * cosπ+3/4π^2 (π/6)+sin3π/2

问题描述:

计算sin^2 (π/4)-cos^2 (π/4) * cosπ+3/4π^2 (π/6)+sin3π/2

sin^2 (π/4)-cos^2 (π/4) * cosπ+3/4cos^2 (π/6)+sin3π/2
=1/2-1/2*(-1)+3/4*3/4+(-1)
=9/16