Question

Prove that : (i) cos 55° sin 35° + sin 55° cos 35º = 1
tan 72°
cot 720
(ii)
= 0
cot 18°
tan 18°
(iii) sec 70° sin 20° + cosec 70° cos 20° = 2.​

Answer 1

Step-by-step explanation:

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