यदि  तो 2f(x) – f(2x) =

  1. 2a
  2. a + 4x
  3. a – 4x
  4. a

Answer (Detailed Solution Below)

Option 4 : a
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रखेंधारणा:

यदि  है, तो A का सारणिक निम्न दिया गया है:

|A| = (a­11 × a22) - (a12 - a21).

गणना:

दिया हुआ: 

ज्ञात करना है: 2f(x) – f(2x) =?

इसलिए,                  (x = 2x रखें)

इसलिए, विकल्प (4) सही है।

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