Answer to Question #287574 in Trigonometry for lulu

Question #287574

if P (2π/3) = ( -1/2 , /3/2) then cos Ø =?

Expert's answer

Solution:

"P (2\u03c0\/3) = ( -1\/2 , \/3\/2) \n\n\\\\\\therefore\u00d8 = 2\u03c0\/3\n\n\\\\So, \\cos \u00d8 = \\cos (2\u03c0\/3)\n\n\\\\= \\cos (\u03c0-\\dfrac \u03c03)\n\\\\=-\\cos (\\dfrac \u03c03)\n\\\\=-\\dfrac12"

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