计算:sin225°-tan60°+cos225°=______.
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计算:sin225°-tan60°+cos225°=______. |
答案
sin225°-tan60°+cos225°=(sin225°+cos225°)-tan60°=1-. 故答案为:1-. |
举一反三
求值: (1)sin30°+sin245°+tan260° (2) | (cot30°+4cos60°)(4sin30°-tan60°) |
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计算:sin60°-sin30°-2tan 45° |
计算: (1)2sin260°-tan45°+cos30°-tan30°; (2)3cos60° | 5sin30°-(tan36°-sin255°)0 | . |
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