Quantitative Aptitude Trigonometry

sin A = a/b అయితే, cos A విలువను కనుగొనండి.

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

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