- If sin(θ)=(2√5)/5, and π/2 < θ < π , what is cos (θ)?

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Find the equation of normal to the circle (x-1)² + (y-2)²=10.? Prove that sum of any two integers is also an integer? Is there any integrated circuit that takes an 8 bit input and outputs a 3 bit sum of those inputs? A solid concrete block weighs 169N and is on the ground.? How to improve my number sense for math?