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Trigonometric ratio
A solution \( \Large \left(x, y\right)\ of\ x^{2}+2x \sin xy + 1 = 0 \) is:
A) (1,0)
B) \( \Large \left(1,\ \frac{7 \pi }{2}\right) \)
C) \( \Large \left(-1, \frac{7 \pi }{2}\right) \)
D) (-1, 0)
Correct Answer:
B) \( \Large \left(1,\ \frac{7 \pi }{2}\right) \)
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