Identities
Simplifying Identities
Pythagorean Identities
Verifying Identities
100
1 / (sin x)
What is csc x?
100
(sec x)(cos x)
What is 1?
100
sin²x + cos²x
What is 1?
100

cos2x + tan2x * cos2x = 1

sin2x = sin2x

200
(sin x) / (cos x)
What is tan x?
200
(tan x)(cos x)
What is sin x?
200
1 + cot²x
What is csc²x?
200

1 = tanx * cosx * cscx

1 = 1

300
1 / (sec x)
What is cos x?
300
(sec x) / (tan x)
What is csc x?
300
1 - cos²x
What is sin²x?
300

cos2x + tan2x * cos2x = 1

cos2x + sin2x = 1

400
(cos x) / (sin x)
What is cot x?
400
sin x (csc x - sec x)
What is 1 - tan x?
400
sec²x - 1
What is tan²x?
400

cot2x * sec2x = csc2x

cot2x + 1 = csc2x

500
cos (-x)
What is cos x?
500
csc x - sin x
What is (cos²x) / (sin x) or (cos x)(cot x) ?
500
(1 + csc x)(1 - csc x)
What is -cot²x ?
500

sinx * tanx = secx - cosx

1-cos2x        1-cos2x

---------  =   ---------

cosx              cosx

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