express [tex]\sqrt{2}[/tex] cos x – [tex]\sqrt{5}[/tex] sin x
in the form R cos(x+a), where R > 0 and 0° < a < 90°

express [tex]\sqrt{2}[/tex] cos x – [tex]\sqrt{5}[/tex] sin x
in the form R cos(x+a), where R > 0 and 0° < a < 90°
give the exact value for R and the correct value for a
correct to 3 decimal places

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