化简COS8°-SIN17°SIN9°/COS9°
化简COS8°-SIN17°SIN9°/COS9°
化简(sin15°cos9°-cos66°)/(sin15°sin9°+sin66°)的结果是?
求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)
求值(sin9°cos15°-sin24°)/(sin9°sin15°+cos24°)
cos15°sin9°+sin6°/sin15°sin9°—cos6°=
1.sin7°+cos15°sin8°/cos7°-sin15°cos8°=
(sin7°+cos15°cos8°)/(sin7°-sin15°sin8°)的化简
(Sin15Cos9°—Cos66°)/(Sin15°Sin9°+Sin66°)可以化简为?要过程
化简(cos⁴7°30′-sin⁴7°30′)(sin23°cos8°-sin67°sin8°)
利用和(差)角公式求下列各式的值:(1)sin13°cos17°+cos17°sin17°;cos80°cos20°+s
已知两点A(cos17°,sin17°),B(cos77°,sin77°),O为坐标原点,则∠AOB=————
关于三角函数的计算题(sin8°+sin7°cos15°)÷(cos8°-sin7°sin15°)=?