October 2018 1 139 Report
Dengan menggunakan rumus cos \ (\alpha \ \pm \ \beta), tunjukkan bahwa :
a). cos (90° - α°) = sin α°
b). cos (90° + α°) = -sin α°
c). cos (180° - α°) = -cos α°
d). cos (180° + α°) = -cos α°

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