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If : a = 9, b = 8 and c = x satisfies 3...

If : `a = 9, b = 8 and c = x` satisfies 3 cos C = 2, then : x =

A

`x=5`

B

`x=6`

C

`x=4`

D

`x=7`

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The correct Answer is:
D
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS -Competitive Thinking
  1. In A B C ,= if (a+b+c)(a-b+c)=3a c , then find /Bdot

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  2. If, in a Delta ABC, a = 6cm , b = 8 cm, c = 10cm, then : sin 2A =

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  3. If : a = 9, b = 8 and c = x satisfies 3 cos C = 2, then : x =

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  4. In DeltaABC, a=2cm,b=3cmandc=4cm, then angle A is

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  5. If the lengths of the sides of a triangle are 3, 5, 7, then its larges...

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  6. The smallest angle of the DeltaABC, when a=7,b=4sqrt(3)andc=sqrt(13) i...

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  7. In any DeltaABC, prove that ("sin(A-B)")/("sin(A+B)")=((a^(2)-b^(2))...

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  8. In a !ABC , if 1/(b+c)+1/(c+a)=3/(a+b+c), then angleC=

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  9. In a DeltaABC,angleC=(pi)/(3),"then "(3)/(a+b+c)-(1)/(a+c)=

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  10. In triangle ABC, if A+C=2B, then (a+c)/(sqrt(a^(2)-ac+c^(2))) is equal...

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  11. In triangleABC, a(b^(2)+c^(2))cosA+b(c^(2)+a^(2))cosB+c(a^(2)+b^(2))co...

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  12. In a triangle ABC, if (b+c) / 11 = (c+a) / 12 = (a+b) / 13 then cosA...

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  13. In any DeltaABC under usual notation, a(bcosC-c cosB)=

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  14. If in a DeltaABC,a^(2)cos^(2)A-b^(2)-c^(2)=0, then

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  15. The lengths of the sides of a triangle are alpha-beta, alpha+beta and ...

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  16. In a triangle ABC, a= 4, b = 3, angleA= 60°. Then, c is the root of th...

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  17. In triangle ABC,b=sqrt3 c=1 and angleA=30^(@) then the measure of the ...

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  18. If a, b, c are the sides of the triangle ABC such that a^(4) +b^(4) +c...

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  19. In a triangle ABC, if b+c=2aandangleA=60^(@),"then "DeltaABC is

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  20. If in a DeltaABC, sin A: sin C = sin (A - B): sin (B-C), then a^(2),...

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