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x+ 1/x = 2cosθ (x+ 1/x)³ = (2cosθ)³ x³+ 1/x³+ 3x × 1/x ×(x+ 1/x) = 8cos³θ x³+ 1/x³+ 3 ×2cosθ = 8cos³θ x³+ 1/x³ = 8cos³θ - 6cosθ x³+ 1/x³ = 2(4cos³θ-3cosθ) Using identity [4cos³θ-3cosθ=cos3θ] x³+ 1/x³ = 2cos3θ
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How is G related to L?
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Who is husband of mother of Z?
Which of the following statement(s) is/are true?
Who is the grandmother of M?
How is P related to O?
How O related to Y?