用诱导公式求下列三角函数值(要过程) (1)cos65/6π (2)sin(-31/4π)(3)c用诱导公式求下列三角函数值(要过程)(1)cos65/6π (2)sin(-31/4π)(3)cos(-1182°13′)(4)sin670°39′ (5
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![用诱导公式求下列三角函数值(要过程) (1)cos65/6π (2)sin(-31/4π)(3)c用诱导公式求下列三角函数值(要过程)(1)cos65/6π (2)sin(-31/4π)(3)cos(-1182°13′)(4)sin670°39′ (5](/uploads/image/z/561646-46-6.jpg?t=%E7%94%A8%E8%AF%B1%E5%AF%BC%E5%85%AC%E5%BC%8F%E6%B1%82%E4%B8%8B%E5%88%97%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E5%80%BC%EF%BC%88%E8%A6%81%E8%BF%87%E7%A8%8B%EF%BC%89+%EF%BC%881%EF%BC%89cos65%2F6%CF%80+%EF%BC%882%EF%BC%89sin%EF%BC%88-31%2F4%CF%80%EF%BC%89%EF%BC%883%EF%BC%89c%E7%94%A8%E8%AF%B1%E5%AF%BC%E5%85%AC%E5%BC%8F%E6%B1%82%E4%B8%8B%E5%88%97%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E5%80%BC%EF%BC%88%E8%A6%81%E8%BF%87%E7%A8%8B%EF%BC%89%EF%BC%881%EF%BC%89cos65%2F6%CF%80+%EF%BC%882%EF%BC%89sin%EF%BC%88-31%2F4%CF%80%EF%BC%89%EF%BC%883%EF%BC%89cos%EF%BC%88-1182%C2%B013%E2%80%B2%EF%BC%89%EF%BC%884%EF%BC%89sin670%C2%B039%E2%80%B2+%EF%BC%885)
用诱导公式求下列三角函数值(要过程) (1)cos65/6π (2)sin(-31/4π)(3)c用诱导公式求下列三角函数值(要过程)(1)cos65/6π (2)sin(-31/4π)(3)cos(-1182°13′)(4)sin670°39′ (5
用诱导公式求下列三角函数值(要过程) (1)cos65/6π (2)sin(-31/4π)(3)c
用诱导公式求下列三角函数值(要过程)
(1)cos65/6π (2)sin(-31/4π)(3)cos(-1182°13′)
(4)sin670°39′ (5)tan(-26π/3) (6)tan580°21′
用诱导公式求下列三角函数值(要过程) (1)cos65/6π (2)sin(-31/4π)(3)c用诱导公式求下列三角函数值(要过程)(1)cos65/6π (2)sin(-31/4π)(3)cos(-1182°13′)(4)sin670°39′ (5
cos65π/6=cos(60+5)π/6=cos5π/6=cos(π-π/6)=-cosπ/6=负的2分之根号3
sin(-31π/4)=sin(-32+1)π/4=sin(π/4)=2分之根号2
cos(-1182°13′)=cos(-1080°-102°13′)=cos(-102°13′)=cos102°13′=cos(180°-77°47′)=-cos77°47′
sin670°39′=sin720°-49°21′=-sin49°21′
tan(-26π/3)=tan(-24-2)π/3=tan-2π/3=-tan2π/3=-tan(π-π/3)=tanπ/3=根号3
tan580°21′=tan(720°-139°39′)=-tan(180°-40°21′)=tan40°21′