# MATHEMATICS

(На русском: Пособия по математике)

Here you can find a collection of **trigonometric formulas**, you need to know by heart for solving any trigonometric exercises.

Formulas for **calculating the sines** are interesting too. These formulas can be used for calculating a lot of sines.

Also, there are some **approximations of pi** with different accuracy. Sometimes the application of these approximations can be very useful.

Online service **"decomposition of the number to a multiplier"** allows to decompose any given number to primes multiplier, as well as to all possible pairs of multiplier.

Online service for **solution of equations** allows to solve the equations of the second, third and fourth power.