Mathematics, 18.10.2019 18:30 nanett0226

Ireally need some !
cos(a - b) + cos(a + b) =
a. 0
b. 2cosacosb
c. 2sinasinb
d. 2(cosacosb + sinasinb)

Answers: 1

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Ireally need some !
cos(a - b) + cos(a + b) =
a. 0
b. 2cosacosb
c. 2sinas...