GisezjgFamoralce GisezjgFamoralce

04-11-2016
Mathematics

contestada

Write the expression as the sine, cosine, or tangent of an angle.

cos 8x cos 2x - sin 8x sin 2x

Respuesta :

syed514 syed514

09-11-2016

cos 8x cos 2x - sin 8x sin 2x = 1/2 sqrt(2+sqrt(3)

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scme1702 scme1702

13-11-2016

cos(A - B) = cos(A)cos(B) - sin(A)sin(B)
Thus,
cos(8x)cos(2x) - sin(8x)sin(2x)
= cos(8x - 2x)
= cos(6x)

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