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AP EAMCET2016MathematicsTrigonometric Ratios & Identities

If (x)= 5 4 , then (3 x) is equal to

Options

  1. A61 16
  2. B63 16
  3. C65 16
  4. D61 63

Correct answer

C. 65 16

Step-by-step solution

aligned & Given, h(x)= 5 4 & Now, h(3 x)=4 h^3(x)-3 h(x) & =4 ( 5 4 )^3-3 5 4 = 125 16 - 15 4 & = 125-60 16 = 65 16 aligned

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