- How to simplify 2(-1/sqrt(50))*(-7/sqrt(50))?

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Vector A makes an angle of 20° and B makes an angle of 110° with the x axis. The magnitudes of A= 20 mag of b = 30. Find angle of resultant? Given that y=0 when x=1, solve the differential equation
xyδy/δx=y²+4,
obtaining an expression for y² in terms of x.? Why can an alcohol hydrogen bond with another alcohol? Two edges of a isosceles triangle are: A(2,-2) and B(6,0). Its area is A=20 cm^2. Edge C=? Does induction motor reactanceinductance is constant ? In stepper motor it is not.?