If in a `/_\ABC, a^2cos^2A=b^2+c^2,` then angle A is
(A) less than `45^0` (B) more than `45^0` and less than `90^0`
(C) right angled (D) obtuse angle

The value of int_0^1 e^(x^2)dx is (A) less than e (B) greater than 1 (C) less than e but greater than 1 (D) all of these

In a triangle A B C , the altitude from A is not less than B C andthe altitude from B is not less than A C . (a)The triangle is right angled (b) isosceles obtuse angled (d) equilateral

An angle of measure 140^0 is (a)an acute angle (b) an obtuse angle (c)a straight angle (d) a complete angle

In triangle, A B Cif2a^2b^2+2b^2c^2=a^4+b^4+c^4, then angle B is equal to 45^0 (b) 135^0 120^0 (d) 60^0

If in a Delta ABC, angle A = 45^(@) , angle B = 75^(@), then

A triangle whose one angle is more than 90^0 is called (a) a scalene triangle (b) a right triangle (c) an acute triangle (d) an obtuse triangle

If the sines of the angles A and B of a triangle ABC satisfy the equation c^2x^2-c(a+b)x+a b=0 , then the triangle (a) is acute angled (b) is right angled (c) is obtuse angled (d) satisfies the equation sinA+cosA ((a+b))/c

If in a triangle ABC, tanA+tanB+tanC>0 the triangle is (A) acute angled triangle (B) obtuse angled (C) right angled (D) none of these

An angle of measure 90^0 is called (a) a complete angle (b) a right angle (c) a straight angle (d) a reflex angle

An angle of measure 0^0 is called (a)a complete angle (b) a right angle a(c) straight angle (d) None of these