What is formula of sin A+B .sin A-B

cos A+B. cos A-B

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

When an object is heated it contracts. a. true b. false

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?