Lượng giác

T

trantien.hocmai

$A=1-\frac{3}{4}\sin ^22x+m-\frac{m}{2}\sin ^22x+2.\sin ^22x \\
=m+1+(2-\frac{3}{4}-\frac{m}{2})\sin ^22x \\
\text{theo yêu cầu đề bài ta có} \\
2-\frac{3}{4}-\frac{m}{2}=0 \rightarrow$
 
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