数学
求20道三角函数计算题带解sin²30°+sin²45°-4cos²60°cos45°像这种

2019-05-27

求20道三角函数计算题带解
sin²30°+sin²45°-4cos²60°cos45°
像这种
优质解答
(1)sin300°+tan240°.
(2)sin420°cos750°+sin(-330°)cos(-660°);
(3)tan675°tan765°-tan(-300°)+tan(-660°);
(4)sin(25π/6)+cos(25π/3)+tan(-25π/4);
(5)cos80°cos20°+sin80°sin20°;
(6)cos²15°-sin²15°;
(7)(1+tan75°)/(1-tan75°);
(8)sin14°cos16°+sin76°cos74°;
(9)2sin75°cos75°;
(10)1-2sin²75°;
(11)2tan150°/(1-tan²150°);
(12)sin50°(1+√3tan10°);
(13)sin105°cos75°;
(14)sin15°sin30°sin75°;
(15)2cos(9π/13)cos(π/13)+cos(5π/13)+cos(3π/13);
(16)cos10°cos30°cos50°cos70°;
(17)tan10°tan50°tan70°;
(18)sin20°+sin40°-sin80°;
(19)(sin20°-cos50°)/(cos20°-cos40°);
(20)sin²10°+cos²40°+sin10°cos40°.
(1)sin300°+tan240°.
(2)sin420°cos750°+sin(-330°)cos(-660°);
(3)tan675°tan765°-tan(-300°)+tan(-660°);
(4)sin(25π/6)+cos(25π/3)+tan(-25π/4);
(5)cos80°cos20°+sin80°sin20°;
(6)cos²15°-sin²15°;
(7)(1+tan75°)/(1-tan75°);
(8)sin14°cos16°+sin76°cos74°;
(9)2sin75°cos75°;
(10)1-2sin²75°;
(11)2tan150°/(1-tan²150°);
(12)sin50°(1+√3tan10°);
(13)sin105°cos75°;
(14)sin15°sin30°sin75°;
(15)2cos(9π/13)cos(π/13)+cos(5π/13)+cos(3π/13);
(16)cos10°cos30°cos50°cos70°;
(17)tan10°tan50°tan70°;
(18)sin20°+sin40°-sin80°;
(19)(sin20°-cos50°)/(cos20°-cos40°);
(20)sin²10°+cos²40°+sin10°cos40°.
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