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2hxy Argand diagram ascending powers asymptotes axis binomial theorem bisects centre centroid chord circle complex number conic conicoid conjugate diameters cos2 cosec cosh cosh2 curve differential coefficient differential equation direction cosines directrix distance dx dx dy/dx ellipse ellipsoid Example Find the co-ordinates Find the equation formula function given equation Hence hyperbola imaginary inertia integral latus rectum length locus mid-point normal obtained origin parabola y2 parallel partial fractions passes perpendicular point of intersection polar positive integer radians radical axis radius of curvature radius of gyration represents respect result right angles roots rough graph Show sin2 sine rule sinh sinh2 slope sphere spherical triangle ABC straight line surface tan2 tangent plane tanh theorem Theorem.—To find Theorem.—To prove variable x-axis yv Zj zero