5. निम्नलिखित सर्वसमिकाएँ सिद्ध कीजिए, जहाँ वे कोण
antur
(i) (cosec -cot 0)2:
1 - cos @
1 +cos e
COS A
1 + sin A
= 2 sec A
1 + sin A
COS A
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