Identities
Simplifying Identities
Pythagorean Identities
Ancient History
100
1 / (sin x)
What is csc x?
100
(sec x)(cos x)
What is 1?
100
sin²x + cos²x
What is 1?
100
sin 30
What is 1/2?
200

Sin(2x)

What is 2sin(x)cos(x)?

200
(tan x)(cos x)
What is sin x?
200
1 + cot²x
What is csc²x?
200
tan 135
What is -1?
300

Cos(x +y)

What is cos(x)cos(y) - sin(x)sin(y)?

300
(sec x) / (tan x)
What is csc x?
300
1 - cos²x
What is sin²x?
300
11pi/6 radians
What is 330 degrees?
400

Tan(x - y)

What is tan(x) - tan(y)/1 + tan(x)tan(y)

400
sin x (csc x - sec x)
What is 1 - tan x?
400
sec²x - 1
What is tan²x?
400
Factor 4x² - 9
What is (2x + 3)(2x - 3)
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
2/(x + 1) + 3/(x - 1)
What is (5x + 1) / (x² - 1)
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