| sinα | cosα | ||
− | =(1−ctgα)(1+tgα) | ||
| cosα | sinα |
| sina | cosa | |||
P=1 − ctg a + tg a − tga ctga = tg a − ctg a= | − | = L. | ||
| cosa | sin a |
| sin | cos | |||
L = | − | = tg − ctg = tg*1 − ctg*1 +1 − 1 = tg*1 − ctg*1 + 1*1 − tg*ctg = | ||
| cos | sin |
| sin2x−cos2x | (sinx+cosx)(sinx−cosx) | |||
L= | = | =U{sinx+cosx | ||
| sinxcosx | sinxcosx |
| sinx−cosx | ||
}{cosx}* | =(tgx+1)(1−ctgx)=P | |
| sinx |