hitunglah cos 315°-tan 210°+sin 45°
Matematika
ngurah123456
Pertanyaan
hitunglah cos 315°-tan 210°+sin 45°
1 Jawaban
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1. Jawaban bapakdr
cos 315 = cos (360-45) = cos 45 = √2/2
tan 210 = tan (180+30) = tan 30 = √3/3
sin 45 = √2/2
√2/2 - √3/3 + √2/2
= √2/2 + √2/2 - √3/3
= 2√2/2 - √3/2
= √2 - √3/2
= √2 - ½√3