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If triangleABC is a right angled at A, t...

If `triangleABC` is a right angled at A, then: `cos^(2)B + cos^(2)C=`

A

`-2`

B

`-1`

C

`1`

D

0

Text Solution

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The correct Answer is:
C
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-MULTIPLE CHOICE QUESTIONS - PART - A : BUILDING-UP THE BASE (B) Properties of triangles
  1. The sides of a triangle are sin alpha, cos alpha and sqrt(1+ sin alpha...

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  2. If, in a Delta ABC, tan A = 1 and tan B = 2, then : tan C = .......

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  3. If triangleABC is a right angled at A, then: cos^(2)B + cos^(2)C=

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  4. If sinA + sin B + sin C = (3sqrt(3))//2 then Delta ABC is

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  5. If : cos^(2) A + cos^(2) B + cos^(2) C = 1, "then" : Delta ABC is

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  6. In Delta ABC a cdot sin(B - C) + b cdot sin (C - A) + c cdot sin (A ...

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  7. If cos A = (sin B)/(2 sin C) , then Delta ABC is

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  8. If, in a /\ ABC, (2 cos A)/a + (cos B)/(b) + (2 cos C)/(c) = a/(bc) ...

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  9. In Delta ABC (b-c) cdot sin A + (c - a) cdot sin B + (a - b) cdot si...

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  10. In any triangle A B C , prove that following: \ (cos^2B-cos^2C)/(b+c)+...

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  11. If the sides of a triangle are x, y and sqrt((x^(2) + xy + y^(2))), t...

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  12. In any DeltaABC, prove that : (a^2 sin (B-C))/(sin B + sin C) + (b^2 s...

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  13. In any DeltaABC, prove that : (b+c) cos A + (c+a) cos B + (a+b) cos C ...

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  14. If theta is real , then: c cdot cos(A - theta) + a cdot cos(C + theta)...

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  15. In Delta ABC, (cot B + cot C)/(cot C + cot A) = ....

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  16. If : 2 sin B cdot cos C = sin A, then Delta ABC is

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  17. If A = 3B and a = 2b, then :m /B = ...

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  18. If mangleA = 60^(@), then (a+b+c)(-a+b+c)=….

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  19. If a ,c , b are in A.P., then : a cos B - b cos A = ........

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  20. In Delta ABC,(cos 2A)/(a^2) - (cos2B)/(b^2) = ......

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