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Matematika SMA Kelas X
Ingat, ¹/₄.π adalah 45°
Diketahui f(x) = sin 2x + cos 2x
Nilai f (¹/₄.π) adalah ...
f (¹/₄.π) = sin 2(¹/₄.π) + cos 2(¹/₄.π)
= sin (¹/₂.π) + cos (¹/₂.π) ⇒ ingat, ¹/₂.π = 90°
= 1 + 0
∴ f (¹/₄.π) = 1