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The angle between the pair of straight l...

The angle between the pair of straight lines `2x^2+5xy+2y^2+3x+3y+1=0` is
(A)` cos^(-1)(4/5)`
(A) `tan^(-1)(4/5)`
(A)` pi/2`
(D) `0`

A

`cos^(-1)(4/5)`

B

`tan^(-1)(4/5)`

C

`0`

D

`(pi)/2`

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TARGET PUBLICATION-PAIR OF STRAIGHT LINES-CRITICAL THINKING
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  2. If the lines (p-q)x^2+2(p+q)xy+(q-p)y^2=0 are mutually perpendicular ,...

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  3. The two lines represented by 3a x^2+5x y+(a^2-2)y^2=0 are perpendicula...

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  4. The angle between the lines given by the equation alphay^(2)+(1-alpha^...

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  5. If the equation ax^(2)+ay^(2)+2gx+2fy+c=0 represents a pair of lines t...

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  6. If the equation ax^2+by^2+cx+cy=0 represents a pair of straight lines ...

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  7. If the equation hxy + gx + fy + c = 0 represents a pair of straight li...

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  8. The angle between the pair of straight lines 2x^2+5xy+2y^2+3x+3y+1=0 i...

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  9. If the angle between the pair of straight lines represented by the equ...

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  10. If the angle between the two lines given by ax^(2)+2hxy+by^(2)+2gx+2fy...

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  11. The equation x^2 - 3xy+ lambday^2 + 3x - 5y + 2 = 0 where lambda is a ...

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  12. Lines represented by 9x^(2)+y^(2)+6xy-4=0 are

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  13. The equation ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents a circle if

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  14. Equation x^(2) +k(1)y^(2) +2k(2)y = a^(2) represents a pair of perpend...

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  15. The equation (x^(2)+y^(2))(h^(2)+k^(2)-a^(2))=(hx+ky)^(2) represents a...

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  16. The equation 2x^2+4xy-py^2+4x+qy+1=0 will represent two mutually perpe...

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  17. If 12x^(2)+7xy+by^(2)+gx+7y-1=0 represents a pair of perpendicular lin...

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  18. If the equation 12x^(2)+7xy-py^(2)-18x+qy+6=0 represents a pair of pe...

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  19. If two sides of a triangle are represented by x^27xy+6y^2=0 and the ce...

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  20. The lines (lx+my)^2-3(mx-ly)^2=0 and lx+my+n=0 forms

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