1

IIT-JEE 1996

MCQ (Single Correct Answer)
$${\sec ^2}\theta = {{4xy} \over {{{\left( {x + y} \right)}^2}}}\,$$ is true if and only if
A
$$x + y \ne 0\,$$
B
$$x = y,\,x \ne 0$$
C
$$x = y\,$$
D
$$x \ne 0,\,y \ne 0$$
2

IIT-JEE 1995

MCQ (Single Correct Answer)
The minimum value of the expression $$\sin \,\alpha + \sin \,\beta \, + \sin \,\gamma ,\,$$ where $$\alpha ,\,\beta ,\,\gamma $$ are real numbers satisfying $$\alpha + \beta + \gamma = \pi $$ is
A
positive
B
zero
C
negative
D
-3
3

IIT-JEE 1995 Screening

MCQ (Single Correct Answer)
The general values of $$\theta $$ satisfying the equation $$2{\sin ^2}\theta - 3\sin \theta - 2 = 0$$ is
A
$$n\pi + {\left( { - 1} \right)^n}\pi /6$$
B
$$n\pi + {\left( { - 1} \right)^n}\pi /2 $$
C
$$n\pi + {\left( { - 1} \right)^n}5\pi /6$$
D
$$n\pi + {\left( { - 1} \right)^n}7\pi /6$$
4

IIT-JEE 1995 Screening

MCQ (Single Correct Answer)
$$\,3{\left( {\sin x - \cos x} \right)^4} + 6{\left( {\sin x + \cos x} \right)^2} + 4\left( {{{\sin }^6}x + {{\cos }^6}x} \right) = $$
A
11
B
12
C
13
D
14

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