Уравнения и тождества в математике на английском языке. Equations and Identities

There are different kinds of equations. In general the equation is an equality with one or several unknown variable(s). The reading of equations is the same as in Russian:

30 + 15 + x? + x? = 90 – is read: thirty plus fifteen plus x squared plus x cubed is equal to ninety.

2 + b + v6 + b4 = 160 – is read: two plus b plus the sqare root of six plus b to the fourth power is equal one hundred and sixty.

The identity is an equality, valid at all admissable values of its variables.
The identities are read:

a + b = b + a – a plus b equals b plus a;

sin2x + cos2x = 1 – sine squared x plus cosine squared x is equal to one.

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