Question

If cosα = 4 /5 and α is an acute angle, find the value of sinα and tanα

Answer 1

Answer:

cos a= 4/5

sin a= √1-cos²a

= √ 1-(4/5)²

= √ 1- 16/25

= √ 9/25

= 3/5

Then ,tan a = sin a/cos a

= (4/5)/(3/5)

= 4/3