Discover Questions

If 3sinB=sin(2A+B) then prove that tan(A+B)/tanA=2? Can i charge 20v battery using 3.7v Protected charging board (TP4056) with step up booster (.05v-30v).? What kind of Neutrino Did ICE discover? Which one is correct: 1) coal turned into ashes or 2) coal turned to ashes? Can someone explain to me? The width of a rectangle is 13 feet less than twice it’s length. If the area of the rectangle is 68 square feet, find its length and width.?