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Which sum or difference identity could be used to prove that sin(π + q) = -sin q is...
Mathematics, 27.05.2020 20:07 winnie45
PLEASE HELP
Which sum or difference identity could be used to prove that sin(π + q) = -sin q is an identity?
A: cosπcosq - sinπsinq
B: cosπcosq + sinπsinq
C: sinπcosq - cosπsinq
D: sinπcosq + cosπsinq
Answers: 2
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