Nilai sin 135° - cos 225° + tan 405°

sin 135 - cos 225 + tan 405

sin 135 = sin (180 - 45) = sin 45
= (1/2)√2 (Kuadran II , sin +)

cos 225 = cos (180 + 45) = -cos 45
= (-1/2)√2 (Kuadran III , cos -)

tan 405 = tan (360 + 45) = tan 45
= 1

(1/2)√2 - ( -1/2 √2) + 1
= (1/2)√2 + (1/2)√2 + 1
= 2 × (1/2)√2 + 1
= 1 + √2