Question

The equation 2 cos $\theta -3sin\theta -A=0$ has real solution in $\theta$, then

• A. A = -4
• B. $|A|\le \sqrt{13}$
• C. | A | < 5
• D. | A | = 5.

Answer 1

Answer: (B)

Correct answer is (b) $|A|\le \sqrt{13}$