Undergraduate

( 4 points ) Use the fact that sin ^ ( 2 ) ( x ) + cos ^ ( 2 ) ( x )

(4 points ) Use the fact that sin^(2)(x)+cos^(2)(x)=1 to prove that tan^(2)(x)+1=sec^(2)(x) for all x so that cos(x)!=0.

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1 Understanding Responsive Design Principles

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