rcetrangolo
22.04.2020 •
Mathematics
Which sum or difference identity could be used to prove that sin(pi+q)=-sinq
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Ответ:
see explanation
Step-by-step explanation:
Using the Addition formula for sine
sin(x + y) = sinxcosy + cosxsiny
and sinπ = 0, cosπ = - 1, then
sin(π + q)
= sinπcosq + cosπsinq
= 0. cosq + (- 1)sinq
= 0 - sinq
= - sinq ← as required
Ответ: