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we first remember the double angle formula, a really important formula. cos(2x) = cos²(x) - sin²(x).We know that sin²(x) + cos²(x) = 1, therefore, cos(2x) = cos...

dy/dx = 3x² - 8x - 3
when dy/dx = 0 , 0 = 3x² - 8x - 3
Factorise : 0= (3x + 1)(x - 3)
when 3x+1 =0 , x = -1/3when x-3=0 , x =3
so x = -1/3 , 3co-ordinates are : (...

By the physical/inorganic pump, the biological/organic pump and the carbonate pump. physical involves the movement of carbon dioxide from the atmosphere to the ocean via diffusionbiological is driven by p...

Le supermarché est situé près de chez moi.Il a posé son sac sous la table.Nous sommes partis après la fin du concert.Le cinéma est à gauche de l’opéra.Nos amis habitent l’appar...