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Could someone help me solve these?

1. (Cos 13 + sin 13)/ (cos 13 - sin 13) = tan A

What is A?

2. (sin 20 cos 70 + cos 20 sin 70)/ (sin 23 cosec 23 + cos 23 sec 23)= ?

3. If tan a = 5/6 and tan b = 1/11, then what is the value of a + b ?

Qno.1https://www.meritnation.com/ask-answer/question/cos13-sin13-cos13-sin13-tana-find-a/triangles/10834921

Qno.3https://www.meritnation.com/ask-answer/question/1-if-tan-a-5-6-and-tan-b-1-11-prove-a-b-pi-42-find-gener/trigonometric-functions/5089964

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