Question

2 tam² 45° + cos²3° - sim? 60'​

Answer 1

Answer:

2 tam² 45° + cos²3° - sim? 60'

Step-by-step explanation:

sin245−sin260=xcos245

⇒(21)2−(23)2=x(21)2

⇒(22)2−(23)2=x(22)2

⇒42−43=42x

⇒−41=21x

⇒x=−21