Warning: file_put_contents(/www/wwwroot/ppbbu/laei.cn/cache/a241935a9ab772962eac82b0f1eacd12.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/laei.cn/index.php on line 58 reduction formula英英字典_reduction formula剑桥英语解释_reduction formula柯林斯英文解释_按摩法牛津词典
1. N a formula, such as sin (90° ± A) = cos A, expressing the values of a trigonometric function of any angle greater than 90° in terms of a function of an acute angle 降次换算公式[maths]