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All others can be derived from these and a little calculus:

sin2x+cos2x=1

sec2x-tan2x=1

sin(a+b)=sin(a)cos(b)+sin(b)sin(a)

cos(a+b)=cos(a)cos(b)-sin(a)sin(b)

eix=cos(x)+i*sin(x)

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Q: What are five trigonometric identities?
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Related questions

Where can one find a list of trigonometric identities?

Trigonometric identities involve certain functions of one or more angles. These identities are useful whenever expressions involving trigonometric functions need to be simplified.


How do you simplify trigonometric expressions?

Use the trigonometric relations and identities.


Are trigonometric identities important?

Yes. Trigonometric identities are extremely important when solving calculus equations, especially while integrating.


What is the term trigonometry identity?

Trigonometric identities are trigonometric equations that are always true.


What does trigonometric identities all about?

They are true statements about trigonometric ratios and their relationships irrespective of the value of the angle.


What are the identities in trigonometry?

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.


What is trigonometric identities?

Just as with any other identity, a trigonometric identity is a trigonometric statement (other than a definition), which is true for all values of the variable or variables.


Why do you solve trigonometric equations?

Use trigonometric identities to simplify the equation so that you have a simple trigonometric term on one side of the equation and a simple value of the other. Then use the appropriate inverse trigonometric or arc function.


Seventh grade math problems?

you should just know about... -Trigonometric Identities-Logarithms, and Natural Logs-Limits-Derivatives


Topics need for trigonometry?

There are several topics under the broad category of trigonometry. * Angle measurements * Properties of angles and circles * Basic trigonometric functions and their reciprocals and co-functions * Graphs of trigonometric functions * Trigonometric identities * Angle addition and subtraction formulas for trigonometric functions * Double and half angle formulas for trigonometric functions * Law of sines and law of cosines * Polar and polar imaginary coordinates.


What has the author Roger G Cunningham written?

Roger G. Cunningham has written: 'Computer generated natural proofs of trigonometric identities'


How do you solve complicated trigonometry questions?

You make them less complicated by using trigonometric relationships and identities, and then solve the less complicated questions.