Ответ:
sin²b+cos²b=1
sin²b=1-cos²b
sinb=√1-cos²b=√1-0,8²=√1-0,64=√0,36=0,6
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Ответ:
sin²b+cos²b=1
sin²b=1-cos²b
sinb=√1-cos²b=√1-0,8²=√1-0,64=√0,36=0,6