√2cos ( π/4 - x ) = .... a. sin 2x - cos2x b. sin x + cos x c. sin x - cos x d. sin 2x + cos 2x e. √2 sin x
Matematika
Lunaemily
Pertanyaan
√2cos ( π/4 - x ) = ....
a. sin 2x - cos2x
b. sin x + cos x
c. sin x - cos x
d. sin 2x + cos 2x
e. √2 sin x
a. sin 2x - cos2x
b. sin x + cos x
c. sin x - cos x
d. sin 2x + cos 2x
e. √2 sin x
1 Jawaban
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1. Jawaban DB45
trigonometri
√2 cos (π/4 - x) = √2 [ cos π/4 sin x + sin π/4 cos x ]
= √2 [¹/₂ √2 sin x + ¹/₂√2 cos x ]
= sin x + cos x