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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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cos(-585°)/sin495°+sin(-570°)的值是老师给了答案是根号2-2,要求我
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
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
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
cos(-585°)/[sin495°+sin(-570°)]
=cos(135°-720°)/[sin(135°+360°)+sin(150°-720°)]
=cos135°/(sin135°+sin150°)
=(-根号2/2)/(根号2/2 +1/2)
=(-根号2)/(根号2 +1)
=(-根号2)(根号2 -1)
=-2+根号2
(=根号2 -2)
cos(-585°)/sin495°+sin(-570°)的值是
sin495°+cos(-225°)的值等于
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
①sin(-π/4)②sin13/6π③cos5/4π④tan(-7/4π)⑤-cos(-300°)⑥sin495°
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COS(-15°)=?
cos(-15°)=
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