October 2019 1 11 Report
17. Jika a cotan a + b cosec a = x2 dan
b cotan a + a cosec a = y2. maka nilai dari
(x^4 - y^4) adalah ....
A. a² +6²
b. a^2-b^2
C. B² - a^2
D. (a - b)2
E. (a + b)2​

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