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cos 40 = 0,766
tan 40 = 0,8391
sin 140 (ada di kuwadran 2 )
rumus = (180 - α ) = 140
180 - 40 = 140
jadi sin 140 = sin 40
cos 220 (ada di kuwadran 3)
rumus = (180 + α ) = 220
180 + 40 = 220
jadi cos 220 = cos 40
tan 320 (ada dikuwadran 4)
rumus = (360 - α ) = 320
360 - 40 = 320
jadi tan 320 = tan 40
masukkan rumus
sin 40 + cos 40 - tan 40
0,6428 + 0,766 - 0,8391
0,5697