exam Maths Puzzle Numerical Ability

use an identity to find the value of sin^2 50degrees+cos^2 50degrees

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exam Other Question

consider g(3)=x^3+4x; what is the maximum number of turns it can have?
a. 2
b. 1
c. 3
d. 4 how many php 80000be invested part at 7% and the rest 6% so that both investments produce equal income?