# Find Help With Math.

## Half angle formula

Trig identities are crucial part of trig functions and one of the most important identities in trigonometric functions is the half angle formula. In this post, we talked about different trig identities and formulas. First we recommend to visit the previous posts to review identities, including the double angle formula. Here we talk about half… Continue reading →

## Double Angle Formula

In trigonometry, it is really important to know and able to use identities. One of the main and crucial categories of identities is Double Angle Formula. In this post, we talked about different trig identities and formulas. Double Angle Formulas are trigonometric identities that simplify a trigonometric function of $2x$ as of trigonometric functions of… Continue reading →

## Prime numbers

What is a prime number? In mathematics, we say a natural number $p$ is a prime number if p has exactly 2 factors. For example, 11 is a prime number, because the only factors are 1 and 11. It is easy to see that the only prime numbers less than 10 are 2, 3, 5… Continue reading →

## Why Choose Schoolmath?

I have a Ph.D. in Mathematics and also I won the gold medal in a national math competition in addition to second prize in international math competitions between university students. I teach math at universities in Canada and also I have 15 years of experience in private tutoring.