how is cos(2x) x cos(2x + 2) = cos² 2x+ 2cos2x ?
#can someone explain to me how this person got this answer.
ornate aspen
cedar gobletBOT
how is cos(2x) x cos(2x + 2) = cos² 2x+ 2cos2x ?
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worthy dagger
how is cos(2x) x cos(2x + 2) = cos² 2x+ 2cos2x ?
cuz its not cos(2x+2)
it is cos(2x)+2