What are the exact values of (listed below)?

Question

cos(-120)

sin(-225)

Sin 495

cosec 300

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Answer 1 · 2018-06-27T12:34:31

See explanation below

In goniometric circle we can realize that

#cos(-120)=sin30=sqrt3/2#

#sin(-225)=sin135=sin45=sqrt2/2#

#sin495=sin(495-360)=sin135=sqrt2/2#

#cosec300=1/sin300=1/-sin30=-2#