Prove the following: (a) sin 70° = cos 20°
(b) cosec 65º = sec 25°
(c) tan 60° + cos 50º = cot 30° + sin 40°
(d) sin 35° + cot 15° = cos 55° + tan 75°
(b) cosec 65º = sec 25°
(c) tan 60° + cos 50º = cot 30° + sin 40°
(d) sin 35° + cot 15° = cos 55° + tan 75°
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