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multiple means multiple, plus means plus.
In trigonometry, identities are mathematical expressions that are true for all values of the variables involved. Some common trigonometric identities include the Pythagorean identities, the reciprocal identities, the quotient identities, and the double angle identities. These identities are used to simplify trigonometric expressions and solve trigonometric equations.
the multiple means the number used to multiply. And the factor means a number to multiply or divide by
Try it out! Do the division! If you get an integer (there are no decimals), it means it is a multiple.
Trigonometric identities involve certain functions of one or more angles. These identities are useful whenever expressions involving trigonometric functions need to be simplified.