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sec4 x - tan4 x is equal to ?
  • a)
    1 + tan2 x
  • b)
    2tan2 x - 1
  • c)
    1 + 2tan2 x
  • d)
    None of the above
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
sec4 x - tan4 x is equal to ?a)1 + tan2 xb)2tan2 x - 1c)1 + 2tan2 xd)N...
Concept:
a2 - b2 = (a - b) (a + b)
sec2 x - tan2 x = 1
Calculation:
sec4 x - tan4 x
=(sec2 x - tan2 x) (sec2 x + tan2 x)          (∵ a2 - b2 = (a - b) (a + b))
= 1 × (1 + tan2 x + tan2 x) (∵ sec2 x - tan2 x = 1)
= 1 + 2tan2 x
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Most Upvoted Answer
sec4 x - tan4 x is equal to ?a)1 + tan2 xb)2tan2 x - 1c)1 + 2tan2 xd)N...
Concept:
a2 - b2 = (a - b) (a + b)
sec2 x - tan2 x = 1
Calculation:
sec4 x - tan4 x
=(sec2 x - tan2 x) (sec2 x + tan2 x)          (∵ a2 - b2 = (a - b) (a + b))
= 1 × (1 + tan2 x + tan2 x) (∵ sec2 x - tan2 x = 1)
= 1 + 2tan2 x
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sec4 x - tan4 x is equal to ?a)1 + tan2 xb)2tan2 x - 1c)1 + 2tan2 xd)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
Question Description
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