evaluate cos 12° cos 32° cosec 58° cos 60° cosec 78°
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Answer:
1/2
Step-by-step explanation:
cos12 *cosec(90-12) *cos32 *cosec(90-32) *cos60
=cos12 sec12 *cos32 *sec 32 *cos60
as sec (90-theta)= cosec theta
cos12/cos12 *cos32/cos32 *cos60
=1 *cos60
=1/2
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