3(ii) cos (A + B)cos B1, where A and B both lie in second quadrant, findand cos B-3 , where π<A <sm and 37t<B < 2n, find thecos B- . , where π < A <3-and 0 < B < π , find tan (A + B).os B-12 , where π <A < π and 3π < B < 2, find tan (A-B).os B-43 ,, where π <A < π and 0 < B < π , find the following1213(ii) cos (A B)41132222(ii) tan (A B)6llowing:18o - cos 78° sin 18°s 9°+ cos 36° sin 9°and cot B-t , where A lies in the second quadrant and(ii)(iv)cos 47 "cos 13°-sin 47。cos 80° cos 20°+ sin 80the values of the following(ii) cos (A + B)(iii) tan (A + B)12121212A tan B sin (A+ B)A tan B sin (A B)cos 9°sin 9o0n 11°= tan 54。

3(ii) cos (A + B)cos B1, where A and B both lie in second quadrant, fi

1.	3(ii) cos (A + B)cos B1, where A and B both lie in second quadrant, findand cos B-3 , where π<A <sm and 37t<B < 2n, find thecos B- . , where π < A <3-and 0 < B < π , find tan (A + B).os B-12 , where π <A < π and 3π < B < 2, find tan (A-B).os B-43 ,, where π <A < π and 0 < B < π , find the following1213(ii) cos (A B)41132222(ii) tan (A B)6llowing:18o - cos 78° sin 18°s 9°+ cos 36° sin 9°and cot B-t , where A lies in the second quadrant and(ii)(iv)cos 47 "cos 13°-sin 47。cos 80° cos 20°+ sin 80the values of the following(ii) cos (A + B)(iii) tan (A + B)12121212A tan B sin (A+ B)A tan B sin (A B)cos 9°sin 9o0n 11°= tan 54。
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