Question # 1

cos2a=______;

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cos2 a-sin2 a

2cos2 a-1

1-2 sin2 a

All of these

An equation containing at least one derivative of a depends variable with respect to independent variable is a (an)

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Implicit equation

Differential equation

General equation

None of these

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If a,β are the roots of ax2+bx+c=0,the equation whose roots are doubled is

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ay2 +2by+c=0

ay2+2by+4c=0

ay2+2by+c=0

ay2+by+4c=0

f(x) = ax + b will be a constant function if

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a = 1 , b = 1

a = 1 , b = 0

The middle term of [1/x-x]¹⁰is

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-152

-252

371

-421

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3 sec²x

3 sec²3x

sec²3x

sec²x

If (2,0) is the vertex and y-axis is directrix of parabola then focus is

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(2,0)

(-2,0)

(4,0)

(-4,0)

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Cos 0° = ______

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-1

0

1

Undefined

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