Ответ:
Объяснение:
1-cos² a+tg² a*cos²a
1-cos² a = sin^2 a
tg² a*cos²a = sin^2 a/ cos^2 a * cos^2 a = sin^2 a
sin^2 a + sin^2 a = 2 sin^2a
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Answers & Comments
Ответ:
Объяснение:
1-cos² a+tg² a*cos²a
1-cos² a = sin^2 a
tg² a*cos²a = sin^2 a/ cos^2 a * cos^2 a = sin^2 a
sin^2 a + sin^2 a = 2 sin^2a