cos 30°. sin 210° - csc (-90°) + sec 0° sama dengan
Matematika
inaa205
Pertanyaan
cos 30°. sin 210° - csc (-90°) + sec 0° sama dengan
1 Jawaban
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1. Jawaban johannahelina
cos30° × sin210° - cosec(-90°) + sec0°
= 1/2√3 × - sin(180° + 30°) - (- cosec90°) + 1
= 1/2√3 × - sin30° + cosec90° + 1
= 1/2√3 × -1/2 + 1 + 1
= - 1/4√3 + 1 + 1
= 2 - 1/4√3