August 2018 1 44 Report
Nilai sin 300 derajat dikali cos 150 derajat, sama dengan...
sin x (derajat)= -1/2 untuk 0 (derajat) ≤ x ≤ 360 (derajat) adalah...
buktikan bahwa 1-tan α per sec α = cos α - sin α ?
mohon bantuannya :)

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