(cos15+sin15)(cos15-sin15) 等于多少阿?
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(cos15+sin15)(cos15-sin15) 等于多少阿?
(cos15+sin15)(cos15-sin15) 等于多少阿?
(cos15+sin15)(cos15-sin15) 等于多少阿?
cos15平方—sin15平方 也就等于二分之根号三.
(cos15-sin15)/(cos15+sin15)要过程!
(cos15+sin15)(cos15-sin15) 等于多少阿?
sin15度-cos15度
sin15度cos15度化简
sin45*cos15+cos225*sin15
化简sin15°-cos15°/sin15°+cos15°
(sin15°-cos15°)/(sin15°+cos15°)=
sin15°-cos15°/sin15°+cos15°的值?
化简sin15°-cos15°/sin15°+cos15°
sin15°-cos15°/sin15°+cos15°的值?
(sin15度+cos15度+1)(sin15度+cos15度-1)
sin15°cos15°等于
sin15°+cos15°过程
SIN15度+COS15度=?
sin15度×cos15度=
sin15°cos15°等于?
cos15度sin15度=?
sin15度cos15度=?