Question

If cosA is equal to 2 upon 5 find the value of 4 + 4tan square A

Answer 1

cos A = 2/5
sin A will be √21/5
Therefore tan A = √21/2

Now 4 + 4 tan²A = 4 + 4×21/4 = 4 + 21 = 25

Answer 2

Here cosA=2/5 so base=2 and hypotenuse =5 so perpendicular will be root 21. So tanA square= 21/4 and 4+4tanAsquare=42