May 2020 1 11 Report
Jika a+b+c= π (phi)
Buktikan:
cos (a/2)+cos (b/2) +cos (c/2) = 4 cos (π-a/4) cos (π-b/4) cos (π-c/4)

mohon bantuannya, satu lokal dan guru juga kewalahan menjawabnya.
Anda?

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