几道高一三角恒等变换1.sin347°cos148°+sin77°cos58°2.sin164°sin224°+sin2
1个回答
1.sin(77+3*90)°cos(58+90)°+sin77°cos58°
=sin58°cos77°+sin77°cos58°=sin45°=根号2/2
相关问题
sin347°cos148°+sin77°cos58°等于 ______.
sin347°cos148°+sin77°cos58°等于 ______.
sin347°cos148°+sin77°cos58°等于 ______.
Sin347度Cos148度+Sin77度Cos58度
化简:2分之3cosX-2分之根号3sinX? sin347°cos148°+sin72°cos58°? sin164°
﹣sin347°×cos32°×cos58°×sin77°=
三角恒等变换 cos10°-√3sin10°/sin10°cos10°
【三角恒等变换】cos(33°-x)sin(63°-x)-cos(x+57°)sin(27°+x)
高一数学--三角恒等变换已知sinα+cosβ=1/3,sinβ-cosα=1/2,则sin(α-β)的值是多少?答案是
1.sin164°sin224°+sin254°sin314°