(a) 3510. If sec 4A cosec (A-10") and 4A is acute then(c) 40°(b) 30° – InterviewSolution

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(a) 3510. If sec 4A cosec (A-10") and 4A is acute then(c) 40°(b) 30°(d) 50(a) 20°

Answer»

We know sec ( 90 - A ) = cosec (A)

sec(4A) = cosec ( A - 10)

sec(4A) = sec ( 90 - ( A - 10))

Comparing both sides

4A = 90 - A + 10

5A = 100

A = 100/5

A = 20

Option (a) is correct

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