Trigonometrical Equations 3 Question 14

15. The solution set of the system of equations x+y=2π3,cosx+cosy=32, where x and y are real, is……. .

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Answer:

Correct Answer: 15. No solution

Solution:

  1. Given, x+y=2π3

and cosx+cosy=32 cosx+cos2π3x=32

cosx+12cosx+32sinx=32

12cosx+32sinx=32

sinπ6+x=32, which is never possible.

Hence, no solution exists.



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