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Maths Puzzle
Numerical Ability
if sin A+sin^2 A=1, then find the value of cos^2 A+cos^4 A
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- cos^2 A+ sin^2 A = 1 (property).
comparing the first equation and the above,
=>sin A = cos^2 A
so, sin^2 A = (cos^2 A)^2 = cos^4 A
adding above two,
cos^2 A + cos^4 A = sin A + sin^2 A = 1
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