已知A(cos77°,sin77°)B(cos17°,sin17°) 求直线AB的斜率
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已知A(cos77°,sin77°)B(cos17°,sin17°) 求直线AB的斜率
已知A(cos77°,sin77°)B(cos17°,sin17°) 求直线AB的斜率
已知A(cos77°,sin77°)B(cos17°,sin17°) 求直线AB的斜率
sin77°=sin(60°+17°)=sin60°cos17°+cos60°sin17°=√3/2cos17°+1/2sin17°
cos77°=cos(60°+17°)=cos60°cos17°-sin60°sin17°=1/2cos17°-√3/2sin17°
(sin77°-sin17°)/(cos77°-cos17°)
=(√3/2cos17°-1/2sin17°)/(-1/2cos17°-√3/2sin17°)
=-(cos30°cos17°-sin30°sin17°)/(sin30°cos17°+cos30°sin17°)
=-cos47°/sin47°
=-tan43°=tan137°
已知向量a=(cos77°.sin77°)已知向量a=(cos77°,sin77°),b=(cos32°,sin32°),则a+b的膜长~
已知A(cos77°,sin77°)B(cos17°,sin17°) 求直线AB的斜率
已知向量a=(cos77,sin77),b=(cos32,sin32),则a+b的模长
已知两点A(cos17°,sin17°),B(cos77°,sin77°),O为坐标原点,则∠AOB=————key:π|3 求解析····
sin13°cos77°+cos13°sin77°=
cos77°cos17°+sin77°sin17°=满足cosαcosβ=2分之根号3,-sinαsinβ的一组解是
sin374°cos148°+sin77°cos58° 和sin(a+b)cos(γ-b)-cos(b+a)sin(b-γ)
sin17度sin77度+cos17度cos77度=
sin17°cos13°+cos17°cos77°=
cos43°cos77°+sin43°cos167°=?
cos43°cos77°+sin43°cos167°=?
﹣sin347°×cos32°×cos58°×sin77°=
sin347°cos148°+sin77°cos58°化简
sin347°cos148°+sin77°cos58°
sin347°cos148°+sin77°cos58°怎么算?
化简 (1) sin347°cos148°+sin77°cos58° (2)sin164°sin2化简(1)sin347°cos148°+sin77°cos58°(2)sin164°sin224°+sin254°sin314°
13、化简:(1)3√15sinx+3√5cosx (2)3/2cosx-√3/2sinx (3)√3sinx/2+cosx/2(4)√2/4sin(π/4-x)+√6/4cos(π/4-x) (5)sin347°cos148°+sin77°cos58°(6)sin164°sin224°+sin254°sin314° (7)sin(a+b)cos(γ-b)-cos(b+a)sin
cos43°·cos77°+sin43°·cos167°的值