SSC Delhi Police Head Constable (Ministerial) 2025 Mock Test (New) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
यदि cos x + sin x = √2 cos x है, तो (cos x - sin x)2 + (cos x + sin x)2 का मान कितना है?
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\(\frac{1}{\sqrt2}\)