Can anybody help me with this?
Show that cos(x) - sin(x) can be expressed in terms of a single trigonometric function. Then plot its graph.
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Multiply the expression by sqrt of 2 and it's reciprocal (which is really multiplying by 1):
Distribute just the fraction (1 over sqrt 2):
I know that cos (pi/4) = sin (pi/4) = 1/sqrt(2):
Use the cosine of a sum identity:
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