exam Maths Puzzle Numerical Ability

please help me understand these
in triangle ABC given that sides b=10,c=8, angle A=60degrees, find side a?

in triangle ABC given that sides a=4,b=8 and c=10, find cos B where B is the angle opposite to side b?

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exam Other Question
Find the solutions of the following equations. Check for extraneous solutions.
(x-5)^1/4+3=2 My question is to solve the equation ------9 plus 3i over 2i