Maths question, resultant forces, can't see where ive gone wrong please help

I haven't a clue what ive done wrong, please help its bugging me

Jez, that took longer than it should. Yours looks ok/right and its easy enough to check by subbing 10 degrees back in and checking the forces balance horizontally. Madas value of 35 is way off and horizontally, the resultant force would obviously be to the left as the 12 force is dominant. He goes wrong on line 1 when using the cos rule and the 2abcos(60) is 2*8*6*cos(60). The 6 should be 12 and Id guess hes divided by 2 twice, so applied cos(60) twice.