exam Maths Puzzle Numerical Ability

please help me solve this equation sin 2x-cosx=0

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exam Other Question

Simplify by combining like terms.

x sqrt(18)- 3 sqrt(8x^2) directions: write a rational number in simplest form for each decimal expansion. my decimal is 0.15 with a line over 15 to make it repeating. my fraction is 25/165. am i correct?