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`|[1,cos(alpha-beta), cos alpha] , [cos(alpha-beta),1,cos beta] , [cos alpha, cos beta, 1]|`

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`|[1,cos(alpha-beta), cos alpha] , [cos(alpha-beta),1,cos beta] , [cos alpha, cos beta, 1]|`
A. `sin (alpha + beta)`
B. `sin alpha sin beta`
C. `1 + cos (alpha + beta)`
D. none of these
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2 Answers

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Correct Answer - D
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Method-1

Method-1

Ans (D) none of these

Method - 2

Method - 2

Ans (D) none of these

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