Объяснение:
cos 10 cos 50 - sin 10 cos 50 = cos (10+50) = cos 60 = 1/2
Sin 10 cos 20 + cos 10 sin 20 = sin (10+20) = sin 30 = 1/2
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Объяснение:
cos 10 cos 50 - sin 10 cos 50 = cos (10+50) = cos 60 = 1/2
Sin 10 cos 20 + cos 10 sin 20 = sin (10+20) = sin 30 = 1/2