Quantitative Aptitude Trigonometry Circular Measure of Angles

sin72° = a/b, అయిన cos72° + sin18° విలువ కనుగొనండి.

1
\(\frac{{\sqrt {{b^2} - {a^2}} }}{b}\)
2
\(\frac{{\sqrt {{a^2} - {b^2}} }}{a}\)
3
\(\frac{{2\sqrt {{b^2} - {a^2}\;} }}{b}\)
4
2 (b/a)

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