Question

Point definition by Mohi Chinese philosopher

finding the equation of a tangent and normal

finding the equation of a tangent

(1+y2)dx+2xy-dx=o

(1+y2)dx+2xy-dx=o solve

prove that tan^-1(2ab/a^2 -b^2) +tan^-1( 2xy/x^2 - y^2) =tan^-1(2pq/p^2 - q^2)

Solve dy/dx+ y tanx=secx

Sin(x+y)dy/dx=1

NCERT 9th class

find decimal expression 

pair of linear equations in two variables

A well of diameter 3cm is dug 21m deep. The earth taken out of it has been spreaded evenly all around it to a width of 4m to form an embankment.find its height