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求下列各式的值: sin260°+cos260°-tan45°;
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教案备课库《初二年级数学同修学案201522055B》真题及答案
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已知tanα=3求下列各式的值122sin2α-3sinαcosα-1.
求下列各式的值.tan45°·sin60°-4sin30°·cos45°+·tan30°.
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下列各式中正确的是
sin20
0
+sin30
0
=sin50
0
;
sin60
0
=2sin30
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;
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0
﹒tan70
0
=1;
cos30
0
<cos60
0
;
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α<β
cotα<cotβ
tanα<tanβ
sinα<sinβ
已知向量a=sinθcosθ-2sinθb=12.1若a∥b求tanθ的值2若|a|=|b|0
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