Question

3(1-2sin²α)-8sinα=5怎么化简

Answer 1

化为3-6sin²α-8sinα-5=0，整理得
6sin²α+8sinα+2=0，
3sin²α+4sinα+1=0

Answer 2

3(1-2sin²α)-8sinα=5
把括号拆开
3-6sin²α-8sinα=5
化简
6sin²α+8sinα+2=0
3sin²α+4sinα+1=0
因式分解
(3sinα+1)(sinα+1)=0
sinα = -1/3 or -1
得出结果
3(1-2sin²α)-8sinα=5
sinα = -1/3 or -1