15.
का मान क्या होगा?
cosn38°-cotn52°
sinn52°-tann38°
(A) 5 (B)7
(C)1
(D) 3
Answers
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Answer:
cos 38° cos 52° - sin 38° sin 52° = cos (90° - 52°) cos (90°-38°) - sin 38° sin 52° = sin 52° sin 38° -
sin 38° sin 52° =0
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