cos 75° x sec 165° x sin 165°
sin 105° x tan 105° x cosec 105°
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SOLUTION
TO DETERMINE
The value of
cos 75° × sec 165° × sin 165° × sin 105° × tan 105° × cosec 105°
EVALUATION
cos 75° × sec 165° × sin 165° × sin 105° × tan 105° × cosec 105°
= cos 75° × sec ( 90° + 75° ) × sin ( 90° + 75° ) × sin ( 180° - 75°) × tan ( 180° - 75° ) × cosec ( 180° - 75° )
= cos 75° × - cosec 75° × cos 75° × sin 75° × - tan 75° × cosec 75°
= sin 75°
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