In triangle ABC, b=4cm, a=9cm and the area of the triangle is 14cm^2. Find the size of angle A...

I believe it's a relatively easy question but I have checked and rechecked my answer and end up as undefined because I get arcsin(>1) if that makes sense.

I have used the relevant sin/cosine rules to work out C & c so that I can put it into the area formula but I believe something has gone wrong. It's really getting to me.

Thanks alot!