Question

Cot theta minus 1 by 2 minus 6 squared equals to what a by 1 + tan a. Prove

Answer 1

(1 + cos/sin - 1/sin ) (1+1/cos + sin /cos )

( cos + sin - 1) (cos + sin +1 )
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cos  * sin

(cos+sin)² - 1²
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cos * sin

1+ 2 cos sin - 1
-----------------
cos * sin

2