1+(1+cosA)(1-cosA)(1+cot^A) =2
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Answer:
1+(1+cosA)(1-cosA)(1+cot^A) =2
L.H.S
1+(1-cos²A)(1+cot²A). {(a-b)(a+b)=a²-b²}
1+(sin²A)(1+cot²A)
1+([sin²A]+[sin²A cos²A/sin²A])
1+(sin²A+cos²A)
1+1
2
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