If the acute alngles betwene the pairs of lines `3x^(2)+7xy+4y^(2)=0` and `6x^(2)-5xy+y^(2)=0` are `theta_(1)` and `theta_(2)` thenA. `theta_(1)-theta_(2)`B. `theta_(1)=2theta_(2)`C. `theta_(2)-2theta_(1)`D. None of these

If the acute alngles betwene the pairs of lines `3x^(2)+7xy+4y^(2)=0`

1.	If the acute alngles betwene the pairs of lines `3x^(2)+7xy+4y^(2)=0` and `6x^(2)-5xy+y^(2)=0` are `theta_(1)` and `theta_(2)` thenA. `theta_(1)-theta_(2)`B. `theta_(1)=2theta_(2)`C. `theta_(2)-2theta_(1)`D. None of these
Answer» Correct Answer - A

The lines represented by the equation `ax^(2)+2bxy+hy^(2)=0` are mutually perpendicular ifA. `a+b=0`B. `b+h=0`C. `h+a=0`D. `ah=-1`
If acute angle between lines `x^(2)-2hxy+y^(2)=0` is `60^(@)` then `h=`A. `-2`B. `+-2`C. `2`D. `sqrt(3)`
The angle between the lines `2x^2-7x y+3y^2=0`is`60^0`2. `45^0`3. `tan^(-1)(7//6)`4. `30^0`A. `60^(@)`B. `45^(@)`C. `tan^(-1)((7)/(6))`D. `30^(@)`
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Find the measure of the acute angle between the lines represented by `(a^(2) - 3b^(2)) x^(2) + 8abxy + (b^(2) - 3a^(2)) y^(2) = 0.`A. `(pi)/6`B. `(pi)/4`C. `(pi)/3`D. `(pi)/2`