Question

if cos A is equal to 2 /5 find the value of 4 + tan square A

Answer 1

heya

cosA=2/5 =b/h

p=√h^2-b^2

p= √25-4

p= √21

so,now tan¢=p/b =√21/2

4 + tan^2¢=4 +(√21/2)^2

4 + tan^2¢=8+ 21/2 Ans

= 29/2 hope it help you .

@rajukumar.