(Sin 25 x sin 35 x sin 55) : (cos 145 x cos 140 x cos 155)

sin 25 × sin 35 × sin 55
=0,198565631
cos 145 × cos 140 × cos 155
=0,0518704633
•0,198565631 : 0,0518704633
=3,8281059846

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