Precalculus - Trigonometric Identities

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(Even/odd id) csc (-t)

-csc t

Reciprocal identities

1/cos= sec 1/sin= csc 1/tan= cot

(Even/odd id) cot (-t)

-cot t

(Even/odd id) sin(-t)

-sin t

(Even/odd id) tan (-t)

-tan t

(Pythagorean I'd) Sin^2+cos^2

1

(Cofunction Identities) sin(π/2-t)

Cos t

(Quotient Id)cot

Cos/sin

(Cofunction identity) tan(π/2-t)

Cot t

(Cofunction identities) sec(π/2-t)

Csc t

(Pythagorean) 1+cot^2

Csc^2

Trig indentities can be used to:

Evaluate trig Functions Simplify trig expressions Develope addition trig id. Solve trig equations

(Cofunction identities) csc(π/2-t)

Sec t

(Cofunction identity) cos(π/2-t)

Sin t

(Quotient Id) tan

Sin/cos

(Cofunction identities) cot (π/2-t)

Tan t

(Even/odd id) cos (-t)

cos t

(Even/odd id) sec (-t)

sec t

(Pythagorean id) 1+tan^2

sec^2


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