2.12 If 1 + cosa + cosa + ............
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2.12 If 1 + cosa + cosa + ........... = 2-12, then a, (0
JEE/Engineering Exams
Maths
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( 1+cos x+cos ^{2} x ) ( A theta ) the fate ( frac{1}{1-cos alpha} ) ( frac{1}{(-cos alpha)}=alpha-52 ) ( -cos alpha=frac{1}{2-sqrt{2}} times frac{2+sqrt{2}}{2+sqrt{2}} ) ( x=pi-frac{pi}{4} ) ( =2 )

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