exam Maths Puzzle Numerical Ability

please solve this problem: please solve the trigonometric equation sin(2x-10 degress)=1/2 give all positive values of the angle between o to 360 degress give any approximate value

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exam Other Question

x^2+4x+7=0 find all real solutions and express in a+bi -15=u+(-5) Please help me in solving this equation.Is the answer u=-10