Jawab:
Penjelasan dengan langkah-langkah:
cos 315° - sin 225° =
√2/2 - -√2/2 = √2
Jawaban:
cos 315 - sin 225
= cos (360-45) - sin (180+45)
= (cos360 cos45 + sin360 sin45) - ( sin180cos45 + cos180 sin45)
= ( 1. 1/2√2 + 0. 1/2√2) - ( 0 . 1/2√2 + (-1). 1/2√2)
= ( 1/2√2 + 0) - ( 0 - 1/2√2)
= 1/2√2 + 1/2√2
= √2
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Jawab:
Penjelasan dengan langkah-langkah:
cos 315° - sin 225° =
√2/2 - -√2/2 = √2
Jawaban:
cos 315 - sin 225
= cos (360-45) - sin (180+45)
= (cos360 cos45 + sin360 sin45) - ( sin180cos45 + cos180 sin45)
= ( 1. 1/2√2 + 0. 1/2√2) - ( 0 . 1/2√2 + (-1). 1/2√2)
= ( 1/2√2 + 0) - ( 0 - 1/2√2)
= 1/2√2 + 1/2√2
= √2