1.

Without using trigonometric tables, prove that:(i) sin212° + sin2 78° = 1(ii) sec229° – cot261° = 1(iii) tan256° – cot234° = 0(iv) cos257° – sin233° = 0(v) sec250° – cot240° = 1(vi) cosec272° – tan218° = 1

Answer» Without using trigonometric tables, prove that:

(i) sin212° + sin2 78° = 1

(ii) sec229° – cot261° = 1

(iii) tan256° – cot234° = 0

(iv) cos257° – sin233° = 0

(v) sec250° – cot240° = 1

(vi) cosec272° – tan218° = 1


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