Respuesta :

Answer:

x = [tex]\sqrt{7^{2} + 5^{2} - 2 .7.5.cos 42}[/tex] = ~4.689

Hope you find it useful, bro!

Answer:

x = \sqrt{7^{2} + 5^{2} - 2 .7.5.cos 42} = ~4.689

Step-by-step explanation: