Question

Value of $co{s}^2(A-B)+co{s}^{2}B-2cos(A-B)cosAcosB$ is

• A. $co{s}^{2}A$
• B. $si{n}^{2}A$
• C. $ta{n}^{2}A$
• D. $co{t}^{2}A.$

Answer 1

Answer: (B)

Correct answer is (b) $si{n}^{2}A$