Math, asked by Reyansh3220, 1 year ago

In cos A=2/5,find the value of 4+4tan'2A

Answers

Answered by mysticd
1
Hi ,

cos A = 2/5 ---( 1 )

value of 4 + 4tan² A

= 4 ( 1 + tan² A )

= 4 sec² A

[ since 1 + tan² A = sec² A ]

= 4 / cos² A

[ since secA = 1/cosA ]

= 4 / ( 2/5 )²

[ from ( 1 ) ]

= 4 × ( 25 / 4 )

= 25

I hope this helps you.

:)
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