Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

ఒకవేళ \(\rm \sinϕ=\frac{1}{\sqrt2}\) , అయితే cos ϕ = ?

1
1
2
√2
3
\(\frac{1}{\sqrt2}\)
4
\(\frac{1}{\sqrt5}\)

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