## Why does cos^2x+sin^2x=1

In above video, we have prove cos^2x+sin^2x=1. It could only possible because square of hypotenuse side is always equal to the sum of square of opposite side and square of adjacent side. .

## Basic Formulas of Trigonometry – Part 1

In this part of Basic Formulas of Trigonometry, we have explain the 6 functions sin, cos, tan, cosec, sec and cot. Out of three Sin, Cos, Tan are the main. These all functions are tells us the relationship between any two side of any triangle. .

## Subtraction Without Borrowing

With taking two examples, I am trying to teach you the subtraction without borrowing.

Today, I will teach you the solution of word problem of addition.

## Which of the following Sampling Method is Based on Probability

(A) Convenience Sampling (B) Quota Sampling (C) Judgement Sampling (D) Stratified Sampling Answer : (D) Explanation : Probability means the chance of happening or not happening of any event. For example, have 100 tickets in the box. In hundred tickets, one ticket is of Rs. 10,00,000, price. .

## If MOHAN is Represented by the Code KMFYL, then COUNT will be Represented by

(A) AMSLR (B) MSLAR (C) MASRL (D) SAMLR Answer : (A)   Explanation Write all the english letter ABCDEFGHIJKLMNOPQRSTUVWXYZ We Say MOHAN as KMFYL   it means ABCDEFGHIJKLMNOPQRSTUVWXYZ   ABCDEFGHIJKLMNOPQRSTUVWXYZ   ABCDEFGHIJKLMNOPQRSTUVWXYZ   ABCDEFGHIJKLMNOPQRSTUVWXYZ   ABCDEFGHIJKLMNOPQRSTUVWXYZ   From .

## Average of averages

The number of observations in a group is 40. The average of the first 10 numbers is 4.5 and the average of the remaining 30 members is 3.5. The average of the whole group is (A) 4 (B) 15/2 (C) 15/4 (D) 6 Answer : (C)    Explanation :  = Average  of first members X 10 + Average .