October 2018 1 19 Report
Di segitiga ABC, diketahui cosA cosB = sinA sinB, dan sinA cosB = sinB cosA, segitiga ABC adalah ...
a. tumpul
b. sama kaki
c. siku-siku & sama kaki
d. sama kaki & tidak siku-siku
e. siku-siku & sama sis
Caranya gimana ya? tolong jelaskan

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