If 2cosθ – sinθ = (1 / √2) , (0°

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2 cosθ – sinθ =	1
	√2

2sinθ + cosθ = x (Let)
On squaring and adding,
4cos²θ + sin²θ – 4 sinθ . cosθ + 4 sin²θ + cos²θ+ 4 sinθ.cosθ

=	1	x²
	2

⇒	1	+ x² = 5
	2

⇒x² = 5 -		1	=	9	⇒ x =	3
		2		2		√2