exam Maths Puzzle Numerical Ability

add
1 + 1
----- + ------
1 - x^2 + x - 1

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exam Other Question

Hi, Can someone assist me with the following problem?
Find the LCM

35c^6a^8,5c^8a^8,14c^4a^6
Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides-->4

Correct answer would really be appreciated:)