viva math class 11

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34 Terms

1

cos (x + y)

cos x cos y – sin x sin y

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2

cos (x – y)

cos x cos y + sin x sin y

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3

sin (x + y)

sin x cos y + cos x sin y

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4

sin (x – y)

sinx cosy – cosx 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

cot(x+y)

cotx coty -1 / coty +cotx

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8

cos 2x

cos2x – sin2 x

2 cos2 x – 1

1 – 2 sin 2 x

1-tan2x / 1+tan2x

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9

sin 2x

2 sinx cos x

2tanx/1+tan2x

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10

tan2x

2tanx/ 1-tan2x

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11

sin3x

3sinx-4sin3x

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12

cos3x

4cos3x-3cosx

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13

tan3x

3tanx - tan3x/1-3tan2x

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14

cosx + cosy

2cos([x+y]/2) . cos([x-y]/2)

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15

cosx - cosy

-2sin([x+y]/2) . sin([x-y]/2)

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16

sinx + siny

2sin([x+y]/2) . cos([x-y]/2)

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17

sinx - siny

2cos([x+y]/2) . sin([x-y]/2)

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18

2 cos x cos y =

cos (x + y) + cos (x – y)

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19

–2 sin x sin y

cos (x + y) – cos (x – y)

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20

2 sin x cos y

sin (x + y) + sin (x – y)

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21

2 cos x sin y

sin (x + y) – sin (x – y)

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22

limx—>a. xn - an / x - a

n an-1

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23

limx—>a. sinx/x

1

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24

limx—>a. 1-cosx/x

0

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25

(u±v)’

u’ ± v’

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26

(uv)’

u’v + v’u

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27

(u/v)’

(u’v + v’u )/ v2

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28

d/dx (xn.

nxn-1

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29

d/dx sinx

cosx

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30

d/dx cosx

-sinx

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31

d/dx tanx

sec2x

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32

d/dx cotx

-cosec2x

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33

d/dx cosecx

-cosecx cotx

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34

d/dx secx

secx tanx

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