viva math class 11

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34 Terms

1
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cos (x + y)

cos x cos y – sin x sin y

2
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cos (x – y)

cos x cos y + sin x sin y

3
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sin (x + y)

sin x cos y + cos x sin y

4
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sin (x – y)

sinx cosy – cosx siny

5
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tan (x + y)

tanx + tany / 1-tanx tany

6
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tan (x-y)

tanx - tany / 1+tanx tany

7
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cot(x+y)

cotx coty -1 / coty +cotx

8
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cos 2x

cos2x – sin2 x

2 cos2 x – 1

1 – 2 sin 2 x

1-tan2x / 1+tan2x

9
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sin 2x

2 sinx cos x

2tanx/1+tan2x

10
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tan2x

2tanx/ 1-tan2x

11
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sin3x

3sinx-4sin3x

12
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cos3x

4cos3x-3cosx

13
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tan3x

3tanx - tan3x/1-3tan2x

14
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cosx + cosy

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

15
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cosx - cosy

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

16
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sinx + siny

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

17
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sinx - siny

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

18
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2 cos x cos y =

cos (x + y) + cos (x – y)

19
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–2 sin x sin y

cos (x + y) – cos (x – y)

20
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2 sin x cos y

sin (x + y) + sin (x – y)

21
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2 cos x sin y

sin (x + y) – sin (x – y)

22
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limx—>a. xn - an / x - a

n an-1

23
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limx—>a. sinx/x

1

24
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limx—>a. 1-cosx/x

0

25
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(u±v)’

u’ ± v’

26
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(uv)’

u’v + v’u

27
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(u/v)’

(u’v + v’u )/ v2

28
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d/dx (xn.

nxn-1

29
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d/dx sinx

cosx

30
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d/dx cosx

-sinx

31
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d/dx tanx

sec2x

32
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d/dx cotx

-cosec2x

33
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d/dx cosecx

-cosecx cotx

34
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d/dx secx

secx tanx