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AP EAMCET2012MathematicsTrigonometric Ratios & Identities

If 3 x+4 x=5 , then 6 x 2 -9 ^2 x 2 is equal to

Options

  1. A0
  2. B1
  3. C3
  4. D4

Correct answer

B. 1

Step-by-step solution

Given, 3 x+4 x=5 aligned & 3 ( 2 x 2 1+ ^2 x 2 )+4 ( 1- ^2 x 2 1+ ^2 x 2 )=5 & 6 x 2 +4-4 ^2 x 2 =5 (1+ ^2 x 2 ) & 6 x 2 -9 ^2 x 2 =1 aligned

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