- How can i make the left side equal to the other? (sinx-cosx) (sinx+cosx)=1-2cos^2x?

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fdfdgdfgfd? Balance the decomposition of N2O4 = NO2? A club has 5 members. From these members they have to pick a president and vice president in how many ways can these 2 positions be filled.? How many liters are needed to react with 155 g of hydrogen? What type of sensor do i need to close 12v circuit measuring low resistance liquid (such as resin or glue) ?