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Transform the equation x/a + y/b = 1 into normal form and hence show that 1/a^2 + 1/b^2 = 1/p^2.
Sunday, February 25, 2018
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Soln: Use formula: cos2A = 2cos^2(A) - 1 cos2A+1= 2cos^2(A) (1+cos2A)/2 = cos^2(A) i.e. cos^2(A) = (1+cos2A)/2
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