Solve the equation for 0 degrees< a < 90 degrees (3.3^2) = (5.1^2) + (8.1^2) - 2(5.1)(8.1)cos
a Very brief explanation would be awesome
I just asked ths question but the answer was not what I was looking for
The answer is 12.3
I don't know how to get it
Thank you for answering my previous question