Question

if sinA=cosA,find the value of 4tan²A+sin²A​

Answer 1

Answer:

If sinA = cosA,

Then A can be equal to 45°

As, sin45° = 1/√2 = cos45°

So, 4tan²A + sin²A

= 4tan²45° + sin²45°

= 4(1)² + (1/√2)²

= 4 + 1/2

= 9/2 (or) 4.5