November 2018 1 149 Report
9. Si: cos (x +y + 20°). sec (6x + y – 60°) = 1, calcule el valor de “x”

10. Si: cos (x + y +30°).sec (3y + x – 10°) = 1, calcule el valor de “y”.

11. Si: sen [(a – b) + x – 4°].cosec [5x – (b –a) – 36°] = 1, calcule el valor de “x”.
12. Si: sen (x + 2y) = cos (y – x) y tg (2x – y) = ctg(20°), calcule el valor de “x”.


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