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s = sin
c = cos
disingkat biar ringkas
a.s + c = 1
b s - c = 1
------------- +
(a+b)s = 2
sin = 2/ a+b.....1
as + c = 1 x b abs + bc = b
bs - c = 1 x a abs - ac = a
----------------- - (dikurang)
(a+b)c = b-a
cos = b-a/ a+b......2
dari 1 dan 2
sin^2 x + cos^2 x = 1
4 / (a+b)^2 + (b-a)^2 /(a+b)^2 = 1
4+b²+a²- 2ab = a²+b²+2ab
4 = 4ab
ab = 1
jawaban E