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  • 04-06-2018
  • Mathematics
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Which of the following is NOT a Trig identity?

Which of the following is NOT a Trig identity class=

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Professor1994 Professor1994
  • 05-06-2018
Option C. is a trigonometric identity
sin^2 A + cos^2 A = 1

Dividing by cos^2 A we get:
sin^2 A / cos^2 A + cos^2 A / cos^2 A = 1 / cos^2 A
tan^2 A + 1 = sec^2 A this is Option B and Option D.

Answer: Option A 
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