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

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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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