lim x tends to 0 sec x - 1 upontan^2x
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tan^2x can be rewritten as sec^2x - 1
then apply the formula (a-b)(a+b)=a^2 - b^2
one of the brackets cancel out
then simply open the limits by putting x = 0
then apply the formula (a-b)(a+b)=a^2 - b^2
one of the brackets cancel out
then simply open the limits by putting x = 0
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