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1

sin(x+y)

sinx cosy + cosx siny

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2

sin(x-y)

sinx cosy - cosx siny

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3

cos(x+y)

cosx cosy - sinx siny

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4

cos(x-y)

cosx cosy + sinx siny

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5

tan(x+y)

tanx +tany / 1-tanx tany

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6

tan(x-y)

tanx +tany / 1+ tanx tany

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7

sin2x

2sinxcosx

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8

cos2x

cos^2x -sin^2x

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9

cos2x

1-2sin^2x

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10

cos2x

2cos^2x-1

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11

tan2x

2tanx / 1-tan^2x

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12

sin^2u

1-cos2u / 2

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13

cos^2u

1+cos2u / 2

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14

tan^2u

1-cos2u / 1+cos2u

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