摘要:计算 (1) Sin30o+cos260o+cot45o-tan30o (2)(tan35o·tan55o)2+tan80o·tan10o+cot40o·cot50o
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计算或解方程:
(1)
-4sin45°-(
-1)+
;
(2)2cos60°+2sin30°+4tan45°;
(3)(x-1)2=2(x-1);
(4)x2+3=2(x+2);
(5)(tan21°•tan69°+sin^33°+cos^33°)•
•
.
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(1)
| 2 |
| cot30°-1 |
| 3 |
| 8 |
(2)2cos60°+2sin30°+4tan45°;
(3)(x-1)2=2(x-1);
(4)x2+3=2(x+2);
(5)(tan21°•tan69°+sin^33°+cos^33°)•
| sin6° |
| cos6° |
| 1 |
| cot84° |