sin347°cos148°+sin77°cos58°
tan525° 化简 用和(差)角公式 sin347°cos148°+sin77°cos58°化简 sin164°sin
sin374°cos148°+sin77°cos58° 和sin(a+b)cos(γ-b)-cos(b+a)sin(b-
1、sin347 cos148+cos13 cos58等于()
已知两点A(cos17°,sin17°),B(cos77°,sin77°),O为坐标原点,则∠AOB=————
用和差角公式化简,化简sin58'cos37'-cos58'sin37'和sin(a b)cosb cos(a-b)si
森冄°仺芊 °
0° 30° 45° 60° 90° 120° 135° 150° 180° 210° 225° 240° 270° 3
tan30° sin30° cos30° tan60° sin60° cos60° tan45°
计算:tan1°*tan2°*tan3°*tan4°.tan87°*tan88°*tan89°.
左上角句号怎么打° ° ° ° ° ° ° 怎么打出来的
cos30°,45°60° tan60°45°30° sin30°60°45°
化简sin12°×sin48°×sin54°?