1.

Cot(45+A)+cot(45-A)=2(cot^2A+1)/cot^2A-1​

Answer»

In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can CAUSE an object with mass to change its velocity, i.e., to ACCELERATE. Force can also be described intuitively as a push or a pull. A force has both magnitude and DIRECTION, making it a VECTOR quantity



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