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Single Choice Questions: 1.Let 0<=al...

Single Choice Questions: 1.Let `0<=alpha, beta, gamma, delta,<=pi` where `beta` and `gamma` are not complementary such that `2cos alpha+ 6 cos beta+7 cos gamma+9 cos delta=0` and `2 sin alpha- 6 sin beta+7 sin gamma-9 sin delta=0` if`cos(alpha+delta)/cos(beta+gamma)=m/n`when m and n are relatively prime positive numbers, then the value of `(m+n)` is equal to (A)11 (B)10 (C)9 (D)7

A

11

B

10

C

9

D

2

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The correct Answer is:
B
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