cos(-585°)/sin495°+sin(-570°)的值是
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cos(-585°)/sin495°+sin(-570°)的值是cos(-585°)/sin495°+sin(-570°)的值是cos(-585°)/sin495°+sin(-570°)的值是cos(
cos(-585°)/sin495°+sin(-570°)的值是
cos(-585°)/sin495°+sin(-570°)的值是
cos(-585°)/sin495°+sin(-570°)的值是
cos(-585°)/sin495°+sin(-570°)
=cos585°/sin495°-sin570°
=cos(540+45)/sin(540-45)-sin(540+30)
=-cos45/sin45+sin30
=-1+1/2
=-1/2
cos(-585°)/sin495°+sin(-570°)的值是
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cos(-585°)/sin495°+sin(-570°)的值是老师给了答案是根号2-2,要求我们写过程
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