MCQ
If A = `(("cos x","sin x"),(-"sin x","cos x"))` then A-1 is equal to:
Options
`(("cos x","sin x"),("sin x","cos x"))`
`(("cos x","- sin x"),("sin x","cos x"))`
`(("cos x"," sin x"),("-sin x","cos x"))`
none of these
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Solution
`(("cos x","- sin x"),("sin x","cos x"))`
Concept: Number System (Entrance Exam)
Is there an error in this question or solution?
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