1.

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​

Answer»

Answer:

1)cos840

=>COS[360+480]

=cos[480]

=cos[360+120&

=cos[120]

=cos [90+30]

= -sin30

= -1\2



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