cos180°怎么算

虞枫中4828cos180°=?
冉娅欣13890415538 ______ -1 ,cos0°=1 cos90°=0 cos180°=-1

虞枫中4828sin 180°、cos180°、sin0°、cos0°、sin1、cos1、sin0、cos0等于多少?这些特殊的角度怎么算?它们各等于多少? -
冉娅欣13890415538 ______[答案] sin 180°=0cos180°=-1sin0°=0cos0°=1sin1=0.01745240643728351cos1=0.9998476951563913 30°: sinα=1/2 ; cosα=√3/2 ; tαnα=√3/3 45°:sinα=√2/2 ; cosα=√2/2 ;tαnα=1 60°:sinα=√3/2 ; cosα=1/2 ; tαnα=√3

虞枫中4828cos180°= -
冉娅欣13890415538 ______ cos180°=﹣1

虞枫中4828cos180度 为什么不等于 cos3.14? -
冉娅欣13890415538 ______[答案] cos180° = cosπ π = 3.14159265. ≠ 3.14 ∴ cos180° ≠ cos3.14

虞枫中4828cos - 180度等于多少?谁能告诉我那些怎么计算是啊?比如说sin45度=sin135这样的啊? -
冉娅欣13890415538 ______[答案] cos-180°=cos180°=-1

虞枫中48286sin( - 90°)+3sin(0°) - 8sin(270°)+12cos(180°)怎么算 有简便方法吗? -
冉娅欣13890415538 ______[答案] 6sin(-90°)+3sin(0°)-8sin(270°)+12cos(180°) =6*(-1)+3*0-8*(-8)+12*(-1) =-6+8-12 =-10 望采纳,多谢了!

虞枫中4828cos(180° - )=? -
冉娅欣13890415538 ______ cos180=-1 望采纳

虞枫中4828 - Cos180°的值是多少 -
冉娅欣13890415538 ______ cos180=-1 所以-cos180=1

虞枫中4828cos1°+cos179°=0怎么算?那么cos1°和cos89°又怎么算? -
冉娅欣13890415538 ______[答案] cos1°+cos179° =cos1°+cos(180°-1°) =cos1°-cos1° =0 2.cos1°+cos89° =cos1°+cos(90°-1°) =cos1°+sin1°

虞枫中48285sin90°+2cos0°+3sin270°+10cos180°求解答, -
冉娅欣13890415538 ______[答案] sin90°=cos0°=1 sin270°=sin(360°-90°)=sin(-90°)=-sin90°=-1 cos180°=-cos0°=-1 所以 5sin90°+2cos0°+3sin270°+10cos180° =5+2-3-10 =-6 希望对您有所帮助