trig identities

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sin = SCCS (same sign) cos = CCSS (diff. sign)

9 Terms

1

Pythagorean Identities (Main Identity)

cos2x + sin2x = 1

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2

Pythagorean Identities (In terms of tan x)

**divide by cos

1 + tan2x = sec2x

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3

Pythagorean Identities (In terms of cos x)

**divide by sin

1 + cot2x = csc2x

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4

Sin sum Identity

sin(a + B) = sin a cos B + cos a sin B

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5

Cos sum identity

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

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6

Sin difference identity

sin ( a - B) = sin a cos B - cos a sin B

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7

cos difference identities

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

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8

sin double agent identities

sin(2b) = 2sin b cos b

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9

cos double agent identities

cos(2b) = cos2b - sin2b OR

1 - 2 sin2b OR

2cos2b - 1

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