Sin(9x)-cos(9x) *write the expression in terms of sine only
the formula of the sine of a sum or difference: sin(α
= sin(π/4) = cos(π/4).
– cos 9x = √(2)
(cos(π/4) ·sin 9x
sin(π/4)· cos 9x)
sin(9x – π/4)
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