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1. Find the value of(i) cos 840°(ii) sin 870° (iii) tan (-120°)(iv) sec (-420) (v) cosec (-690°) (vi) tan (225)(vii) cot (-315°) (viii) sin (-1230°) (ix) cos(4959 |
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Answer» Answer: 1)cos840 =>COS[360+480] =cos[480] =cos[360+120& =cos[120] =cos [90+30] = -sin30 = -1\2 |
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