If the acute angle between the lines $ax^2+2hxy+by^2=0$ is $\frac{\pi}{4}$,then $4h^2=$
- A$(a+b)^2$
- B$a^2+6ab+b^2$
- C$(a-2b)(2a+b)$
- D$a^2-6ab+b^2$
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