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Are ionic bonds weak?

The ionic bonds are stronger than the covalent bonds. The electronegativity between the two elements is much stronger in the ionic bond than the... View Article

What alkali mean?

Alkalis are bases that can be dissolved in water. Few examples of alkalis are potassium hydroxide, sodium hydroxide etc. The pH value of a... View Article

d/dx cos-1 √cos x =

(1) (½) √(sec x + 1) (2) √(sec x + 1) (3) -(½) √(sec x + 1) (4) -√(sec x + 1) Solution: Let y = cos-1 √cos x dy/dx = -1/√(1-cos... View Article

(d/dx)x2 sin (1/x)

(1) cos (1/x) + 2x sin (1/x) (2) 2x sin (1/x) - cos (1/x) (3) cos (1/x) - 2x sin (1/x) (4) none of these Solution: Let y = x2 sin... View Article

(d/dx)[cos (1-x2)2] =

(1) -2x(1-x2)sin (1-x2)2 (2) -4x(1-x2)sin (1-x2)2 (3) 4x(1-x2)sin (1-x2)2 (4) none of these Solution: Let y = cos (1-x2)2 dy/dx... View Article

(d/dx)(x2 ex sin x)

(1) xex (2 sin x + x sin x + x cos x) (2) xex (2 sin x + x sin x - cos x) (3) xex (2 sin x + x sin x + cos x) (4) none of these... View Article

If y = x sin x, then

(1) (1/y)(dy/dx) = 1/x + cot x (2) dy/dx = 1/x + cot x (3) y(dy/dx) = 1/x - cot x (4) none of these Solution: Given y = x sin x... View Article