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What is the answer for question 21) ? http://postimg.org/image/gsm19eu0b/

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lkballer24 | Student, Grade 11 | Valedictorian

Posted August 16, 2013 at 8:49 PM via web

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What is the answer for question 21) ?

http://postimg.org/image/gsm19eu0b/

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted August 16, 2013 at 9:41 PM (Answer #1)

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Pythagorean Identity states that:

1 + `tan^2x=sec^2x`

therefore:

`tan^2x=sec^2x-1`

 which would represent choice d

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