Question # 1

If n € N , then n(n+3) is always

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Multiple of 3

Multiple of 6

odd

even

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If f(√x)=sin x , then f′(x) =______;

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2xcosx2

cosx2

cos√x

None of these

A relation in which the equality is true only for some values of the unknown is called

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An identity

An equation

A polynomial

None

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The trigonometric function are continuous whenever

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They are defined

their limit exist

Their period is given

All are incorrect

The sides of a right angled triangle are in A.P The ratio of sides is

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1:2:3

3:4:5

2:3:4

5:8:3

If a,b,c are unit vectors then |a + b|2 +|a - b|2

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4

8ab

9cos

4(a,b)

Corner point of the system x - y≤ 2,x + y≤ 4,2x -y≤ 6,x≥ 0,y≥ 0

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(1,4)

(4,2)

(3,1)

(4,1)

InΔABC if y = 90° then the Pythagoras theorem is

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b2 + c2 =a2

a2 + b2 = c2

a2 +c2 = b2

None of these

If the roots of ax2 + b =0 are real and distinct then

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ab > 0

a = 0

ab < 0

a > 0,b > 0

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