cosπ/2(t+1),cosπ/2

0.4cos(ωt-11π/2)怎么算
向ta提问私信ta 展开全部 sin[(π/2)(1-t)] =sin(π/2-πt/2) =cos
已知sin(π/6-α)=1/3,求cos(2/3π 2α)
利用等价无穷小数极限lim1 cosπx/(x-1)2
已知:tan(π/4 α)=1/2 (1)求tanα的值; (2)求2sinαcosα-cos方