Question

दर्शाइए कि
(i) cos 55° = sin 35°
(ii) sin² 11° – cos² 79° = 0
(iii) cos² 51° – sin² 39° = 0

Answer 1

Answer:

$cos \: 55 \degree \: = sin \: (90 \degree - 55 \degree) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = sin \: 35 \degree \\ \{ \because \: cos\: \theta= sin \: (90 \degree - \theta) \}$