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°
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(a) sin 70° = cos 20°
LHS = sin 70° = sin(90-20)° = cos 20° = RHS
(b) cosec 65° = sec 25°
LHS = cosec 65° = cosec(90-25)° = sec 25° = RHS
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