- How does -j cot(x) = j tan(x)? What identity is used?

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The volume of a gas at STP is 395 mL. Calculate its volume at 13.2 atm and 205°C.? What pressure in mmHg could 15.0 g of neon gas in a vessel of volume 1.50 dm3 and temperature of 20°C exert? How many 5-cent coin will give $3 ? What is the difference between
Cryptogamae and phanerogams ? How to find the surface area of a hexagonal pyramid? if slant height (not perpendicular height)= 24 and one side of hexagon (the base) = 12?