Asked by Alex

prove:

sec^2(x)=1+tan^2(x)
Answered by Reiny
RS = 1 + sin^2 x/cos^2 x
= (cos^2 x + sin^2 x)/cos^2 x , using common denominator
= 1/cos^2 x
= sec^2 x
= LS
Answered by Galagan
thanks Reiny
Answered by Reiny
wecome,
please stick to one name, switching names makes it hard to go back in replies
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