1. The problem statement, all variables and given/known data If A is an acute angle and sinA = cosA Find the value of 2 tan2 A+ sin2 A-1 2. Relevant equations 3. The attempt at a solution I well tried this way >> 2 (sin 2 A/cos 2A) +sin 2 A-1 = 1+ cos 2 A But I am unable to get the 'value' the answer given in the book is 3/2. Can anybody please suggest any way by which I can get a proper value ? I would be very thankful!