Question

If A is an acute angle and sinA = cosA, find the value of : 2 tan2A + sin2A – 1.

Please answer it fast it's urgent.
Irrelevant answer will be reported. ​

Answer 1

Answer is 2infinity or 2undefined.

Procedure:

given that sinA=cosA where A is acute angle.

we know that 45° is the only acute angle will get same value for both sin and cos.So the value of A=45°.

SUBSTITUTING A IN GIVEN 2tan2A+sin2A-1

this gives 2×tan(45°×2)+sin(2×45°)-1

2×infinity(or)undefined+1-1(where tan90°=infinity and sin 90°=1)

therefore the answer is 2times infinity or undefined....

HOPE THIS HELPS......