If you take a look at sum of first n odd numbers, you can notice very interesting pattern. 1 = 1 $$= 1^2$$ 1 + 3 = 4 $$=2^2$$ … [Continue reading]

## Six Trigonometric Ratios (sin, cos, tan, cot, sec and cosec)

Trigonometric Ratios (sin, cos, tan, cot, sec and cosec) These six trigonometric ratios form the base of trigonometry. So, learn them carefully. Lets suppose we have triangle ABC right angled at B. We have angle $$\theta$$ and $$\alpha$$ in … [Continue reading]

## How to find values of sin 15, sin 75, cos 15, cos 75, tan 15, tan 75, cot 15, cot 75, sec 15, sec 75, cosec 15 and cosec 75 degrees?

In one of the post we learnt values of sin, cos, tan, cot, cosec and sec for 0, 30, 45, 60 and 90 degrees. You can review the post here http://mathinstructor.net/2012/08/values-of-trigonometric-ratios-for-0-30-45-60-and-90-degrees/ … [Continue reading]

## "Pythagoras Theorem" How to find third side of right angled triangle when two other sides are given?

"Pythagoras Theorem" How to find third side of right angled triangle when two other sides are given? Pythagoras theorem states that "In a right angled triangles" square of hypotenuse is equal to sum of squares of other two sides. … [Continue reading]

## How to learn multiplication table of 9?

Everybody in school learns multiplication table of 9. Have you ever noticed something strange about multiplication table of 9? If not then please have a look again. … [Continue reading]