novel the tale of two cities chapter 8,9,10 new words with symptoms
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\huge \fbox \red{Solution}
Solution
1 + CosA/1 - cosA = (CosecA + CotA)²
R.H.S.
= (1/sinA -cosA/sinA)²
= (1-cosA)²/sin²A
= (1-cosA)²/(1-cos²A)
= (1-cos)A)²/(1-cosA)(1+cosA)
= (1-cosA)/(1+cosA). Proved.
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