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Reduce each of the following expressions to the Sine And Cosine ofA single expression:
cos x – sin x
Let f(x) = cos x – sin x
Dividing and multiplying by √(1 + 1) = √2,
Sine of expression:
We know that sinA cosB – cosA sinB = sin(A –B)
Cosine of the expression:
We know that cosA cosB – sinA sinB = cos(A +B)