Question

if cos A equally 2 upon 5 find the value of 4+4 tan square A

Answer 1

hello users ...
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Given that :
cos A = 2/5 

we have to find :
4 +4tan²A = ?

solution :-
we know that :
(1 + tan² x ) = sec²x 
and
secx = 1 / cos x 

Here,
4 + 4 tan² A = 4 (1 + tan² A)

= 4 * sec²A 

= 4 / cos²A 

= 4 * (5/2)²

= 4 * 25 / 4 

= 25 answer 

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# hope it helps :)

Answer 2

Answer:

Cos A=2/5=B/H

H square=P square +B square

P=root of (H square-B square)

P=root ((5×5)-(2×2))

P=root (25-4)

P=root (21)

For,4+4tan squareA

We know that,tan square A=P/B

=4+4×[root (21)/2]square

=4+4×(21/4)

=4+21

=25

Step-by-step explanation:

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