1
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

In a triangle PQR, $$\angle$$R = $$\pi$$/2. If $$\tan \left( {{P \over 2}} \right)$$ and $$\tan \left( {{Q \over 2}} \right)$$ are roots of ax2 + bx + c = 0, where a $$\ne$$ 0, then which one is true?

A
c = a + b
B
a = b + c
C
b = a + c
D
b = c
2
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

In a right-angled triangle, the sides are a, b and c, with c as hypotenuse, and c $$-$$ b $$\ne$$ 1, c + b $$\ne$$ 1. Then the value of $$({\log _{c + b}}a + {\log _{c - b}}a)/(2{\log _{c + b}}a \times {\log _{c - b}}a)$$ will be

A
2
B
$$-$$ 1
C
$${1 \over 2}$$
D
1
3
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

If $${{\cos A} \over 3} = {{\cos B} \over 4} = {1 \over 5}, - {\pi \over 2} < A < 0, - {\pi \over 2} < B < 0$$, then value of $$2\sin A + 4\sin B$$ is

A
4
B
$$-$$ 2
C
$$-$$ 4
D
0
4
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

In a $$\Delta$$ABC, $$2ac\sin \left( {{{A - B + C} \over 2}} \right)$$ is equal to

A
a2 + b2 $$-$$ c2
B
c2 + a2 $$-$$ b2
C
b2 $$-$$ a2 $$-$$ c2
D
c2 $$-$$ a2 $$-$$ b2
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