Ответ:
(2tgx/4)'=(tgx/2)'=1/2cos^2
т.к. (tgx)'=1/cos^2, а 1/2 - const.
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Ответ:
(2tgx/4)'=(tgx/2)'=1/2cos^2
т.к. (tgx)'=1/cos^2, а 1/2 - const.