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Nomor 4
c.)
√2.sin(2x) = tan(2x)
√2.sin(2x) = sin(2x)/cos(2x)
√2 = 1/cos(2x)
cos(2x) = 1/√2 = 1/2 √2
cos(2x) = cos 45°
Maka,
x₁ = 22,5° + k.180°
x₂ = -22,5° + k.180°
d.)
cos x + sin x = 1
Notasi lain:
1.sin(x) + 1.cos(x) = 1
√[1²+1²].cos(x-tan⁻¹(1/1)) = 1
√2.cos(x-45°) = 1
cos(x-45°) = 1/√2 = ½ √2
cos(x-45°) = cos 45°
Selesaian:
x₁ = 90° + k.360°
x₂ = k.360°
Nomor 5.
Ada di lampiran.