<p>@ssgupta Ah nvm. I thought it might’ve been a typo or something since you used - underneath, how silly of me. The + should be replaced with a -. </p>
<p>However I looked a bit further in their solution; the value of c they get (approx. 7.08) is the solution to the INCORRECT equation c^2 = 5^2 + 7^2 + 2<em>5</em>7 cos 110. The correct value of c is roughly 9.90. That means the value of angle A is also incorrect. So they didn’t just typo at one spot; their solution is incorrect.</p>
<p>I got angle A ≈ 44.6 deg (let me know if this is incorrect). </p>