Ответ:
Решение:
sin(7π - a) · cos(15π/2 + b) - sin(19π/2 - a) · cos(6π - b) =
= sin a · sin b + cos a · cos b =
= cos (a - b)
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Verified answer
Ответ:
Решение:
sin(7π - a) · cos(15π/2 + b) - sin(19π/2 - a) · cos(6π - b) =
= sin a · sin b + cos a · cos b =
= cos (a - b)