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There was a time, not long ago, when the introduction of higher secondary education was discussed as a matter of principle or policy. Now, it is no use discussing the merits or demerits of the plan which has been finally accepted. But there is far greater need of discussing the ways and means of making [...]

In real life we find two types of quantities. The quantities that change their values for different mathematical operation are called variable. And the quantities that never change their value are called constant. As for example pi is a constant it is the ration between the circumference and the diameter of a circle. But we [...]

Prove that, Cos pi/15 .Cos 2 pi/15. Cos 3pi/15 .Cos 4pi/15 .Cos5 pi/15. Cos 6pi/15. Cos 6pi/15 = (1/2)^7
Solution: 
Let pi/15 = x then pi = 15x —–(1)
 
Now, pi + x = 16 x
Or, sin (pi + x) = sin 16x
Or, - sin x = 2^4 cos 8x cos 4x cos 2x cos x sin [...]

The sky has spellbound the human brains from time immemorial. The Babylonians had studied the sky three thousand years before Christ. The Greek Thales and Hipparchus applied astronomy to geography. Aristarchus in the third century B.C. surprisingly theorized that the sun was at the centre of the universe.   
 Modern astronomy was founded by Nicholas Copernicus, [...]