If the line `ax + by + c =0` is a normal to the curve `xy+1=0` ,then
1)`ab<0`
2) `ab=0`
3) `ab>0`
d) `ab=-3`

If the line,ax+by+c=0 is a normal to the curve xy=2

If the line ax+by+c=0 is normal to the curve xy+5=0 , then

If the line ax + by + c =0, ab ne 0, is a tangent to the curve xy =1-2x, then

If the line ax+by+c=0 is a normal to the curve x^(3)y=1, then ab is (i) always positive (ii) always neagative (iii) may be negative or positive (iv) can't say anything

If a=cos3 and b=sin8 then 1)a>0,b>0 2) ab b 4) ab>0

If the tangent at the point (a,b) on the curve x^(3)+y^(3)=a^(3)+b^(3) meets the curve again at the point (p,q) then 1) ab+pq=0 2) bq+ab+ap=0 3) bp+aq+ab=0 4) bq+pq+ap=0