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cos2α-1,cos2α+cos2β

(兀-a)cos(2兀-a)tan(-a 兀)/sin(-a-兀)tan(-a-兀),若sin(a-兀)=
(兀-a)cos(2兀-a)tan(-a 兀)/sin(-a-兀)tan(-a-兀),若sin(a-兀)=已知sin(π α)cos(-α 4π)/cosα=1/2 求cos(π/2 α)的值
已知sin(π α)cos(-α 4π)/cosα=1/2 求cos(π/2 α)的值已知sinα-cosα=1/2,求①sin2α②sin4次方α cos4次方阿尔法③cos2
已知sinα-cosα=1/2,求①sin2α②sin4次方α cos4次方阿尔法③cos2tana=1则sin2a cos2a
tana=1则sin2a cos2a若tanα=2 求sinα,cosα的值
若tanα=2 求sinα,cosα的值
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