化简sin68°-cos60°sin8°/cos68°+sin60°sin8°
sin23°cos68°-cos23°sin68°的值
sin30°cos60°+cos30°sin60°=
1.sin7°+cos15°sin8°/cos7°-sin15°cos8°=
(sin7°+cos15°cos8°)/(sin7°-sin15°sin8°)的化简
关于三角函数的计算题(sin8°+sin7°cos15°)÷(cos8°-sin7°sin15°)=?
求(sin8°+sin7°cos15°)/(cos8°-sin7°sin15°)的值
三角函数的转换cos23°cos68°+sin23°sin68°=cos(23°-68°)有这个公式吗,是怎么来的,
化简(cos⁴7°30′-sin⁴7°30′)(sin23°cos8°-sin67°sin8°)
tan30° sin30° cos30° tan60° sin60° cos60° tan45°
sin60°×cos60°+sin45°×cos45°-sin30°×cos30°等于多少
计算10sin60°-6cos30° sin30°+cos60°-cos30°sin45°
sin30° sin45° sin60° cos30° cos45° cos60° 以此类推,都等于多少