Question

if cos A=2÷5then find the value of 4 + 4 tan²A​

Answer 1

Answer:

25.

Step-by-step explanation:

Cos A = 2/5 = B/H

B = 2 ; H = 5

P = root (5^2 - 2^2)

P = root (25 - 4)

P = root 21

=> Tan A = P/B = root 21 / 2

Since, 4 + 4 Tan^2 A

Therefore, 4 + 4 (root 21 / 2)^2

So, 4 + 4 × (21 / 4)

=> 4 + 21 = 25

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