anonymous
  • anonymous
is secxtanx(1-sin^2x)=sinx a trigonometric identity?
Mathematics
schrodinger
  • schrodinger
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welshfella
  • welshfella
Hint: 1 - 2sin^2 x = cos^2 x - also convert secx tanx to sin's and cos's and see what you get
welshfella
  • welshfella
1 - sin^2 x = cos ^2 x sec x = 1/ cos x tan x = sin x / cos x replace these in your identity and see what you can simplify - maybe it will simplify to sin x
welshfella
  • welshfella
if it does then its a trigonometric identity

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anonymous
  • anonymous
okay i'll try that thank you
welshfella
  • welshfella
yw
anonymous
  • anonymous
would the answer be no ?
welshfella
  • welshfella
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welshfella
  • welshfella
can you see where we can cancel out some of the functions?
welshfella
  • welshfella
I am assuming you know that cos^2 x = cos x * cos x

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