exam Maths Puzzle Numerical Ability

please help solve this equation: cos 2x- sin squared x/2 +3/4=0 from 0 to 360 degress.

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exam Other Question

what is the solution to 5w^5/7=160? use the slope intercept form of the linear equation to write an equation of the line with the given slope and y intercept.

slope is - 7 over 9; y-intercept(0, 32 over 9)