Question

If(1+cosA)(1-cosA)=3/4, find secA

Answer 1

(a+b)(a-b) = a²-b²

(1+cosA)(1-cosA) = 3/4
1-cos²A = 3/4
sin²A = (3/4)
sinA = √3/2

therefore, opposite side=√3; hypotenuse=2
so, adjacent side=1

secA = hypotenuse/adjacent
secA = 2/1 = 2

Answer 2

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