Question

Without using trigonometric tables, prove that (7 to 11):
1
(1) sin? 28° cos2 62° = 0
(ii) cos2 25° + cos2 65º = 1
(iii) cosec2 67° - tan2 23° = 1
(iv) sec2 22° - cot? 68° = 1.
2
(i) sin 63° cos 27° + cos 63° sin 27° = 1
(ii) sec 31° sin 59° + cos 31° cosec 59° = 2.
3
(i) sec 70° sin 20° - cos 20° cosec 70º = 0
(ii) sin? 20° + sin2 70° - tan2 45º= 0.
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Answer 1

Step-by-step explanation:

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