Ответ:
4. sin30. = 1/2
3. cos^2a -1/2×(cos pi/3 +cos 2a)= cos^2a-1/2(1/2+cos2a)= cos^2a-1/4-cos2a/2
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Ответ:
4. sin30. = 1/2
3. cos^2a -1/2×(cos pi/3 +cos 2a)= cos^2a-1/2(1/2+cos2a)= cos^2a-1/4-cos2a/2