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sin(x) = -cos(x) ⇔ kalikan -1
-sin(x) = cos(x) ⇔ bagi cos(x)
-sin(x) / cos(x) = cos(x) / cos(x)
-tan(x) = 1
tan(x) = -1
x = 135° atau 315°
Jadi, Himpunan Penyelesaian dari persamaan sin(x) + cos(x) = 0 adalah:
HP: {135° , 315°}
Jadikan Sebagai Solusi Terbaik ya :D ~~~