In triangle ABC, cos^2A + cos^2B - cos^2...

In triangle `ABC, cos^2A + cos^2B - cos^2C = 1`, then the triangle is necessarily

A

isosceles

B

right-angled

C

equilateral

D

obtuse-angled

Text Solution

Verified by Experts

The correct Answer is:

B

Promotional Banner

Promotional Banner

Topper's Solved these Questions

TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE
MARVEL PUBLICATION|Exercise MCQs|101 Videos
TRIGONOMETRIC FUNCTIONS
MARVEL PUBLICATION|Exercise MCQs|175 Videos

Similar Questions

Explore conceptually related problems

In a triangle ABC ,cos A + cos B + cos C = 3/2 , then the triangle ,is

In a triangle ABC,cos^(2)A+cos^(2)B+cos^(2)C=

If cos^(2)A+cos^(2)B+cos^(2)C=1 , then triangle ABC is

In triangle ABC, if cos^(2)A + cos^(2)B - cos^(2) C = 1 , then identify the type of the triangle

In a triangle ABC,cos A+cos B+cos C

In a triangle ABC, cos A+cos B+cos C=

In Delta ABC, if sin^(4)A sin B sin C=1-cos B cos C then triangle is necessarily

In triangle ABC,cos A+2cos B+cos C=2, then-

MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE-MCQs

If, in a DeltaABC,tanA=1andtanB=2, then: tanC= (a) 1 (b) 2 (c) 3 (d) 4
Text Solution
|
If, in a DeltaABC,tanA=1andtanB=2, then: tanC=
Text Solution
|
The value of sin^2 75^0-sin^2 15^0 is 1//2 b. sqrt(3)//2 c. 1 d. 0
Text Solution
|
If DeltaABC is a right-angled at A, then: cos^2B+cos^2C=
Text Solution
|
sin^6A+cos^6A+3sin^2A.cos^2A=
Text Solution
|
If cos(A-B)=3/5and tan A tanB=2, then
Text Solution
|
If A, B, C, D be the angles of acyclic quadrilateral, show that : cosA...
Text Solution
|
If sin.alpha/2+cos.alpha/2=1.4, then: sinalpha=
Text Solution
|
If tanalpha+cotalpha=m then value of tan^4alpha+cot^4alpha is
Text Solution
|
If cos theta+cos phi=a and sin theta - sin phi=b, then: 2cos(theta + p...
Text Solution
|
If sinx+cosecx=2, then, for all n in N, the value of: sin^nx+cosec^nx=...
Text Solution
|
If sinA+sinB+sinC=(3sqrt3)/(2). then: DeltaABC is (a) isosceles (b) ri...
Text Solution
|
In triangle ABC, cos^2A + cos^2B - cos^2C = 1, then the triangle is ne...
Text Solution
|
If tanx=b//a, then: acos2x+bsin2x=
Text Solution
|
(sin^(2)3A)/(sin^2A)-(cos^(2)3A)/(cos^2A)=
Text Solution
|
If t a ntheta1t a ntheta2=k , then ("cos"(theta1-theta2))/("cos"(theta...
Text Solution
|
tan 5x.tan3x.tan2x=
Text Solution
|
If a+btantheta=secthetaandb-atantheta=2sectheta, then: a^2+b^2=
Text Solution
|
If cos25^0+sin25^0=p , then cos50^0 is sqrt(2-p^2) (b) -sqrt(2-p^2) ...
Text Solution
|
If tan(x+y)=33 and x= tan^(-1) 3 then y will be
Text Solution
|