Решение:
sin 25 + sin 35 - cos 5=0
(sin 25 + sin 35) - cos 5=0
[ 2 * sin (35+25)/2 * cos(35-25)/2 ] - cos 5 = 0
[ 2*sin 30 * cos 5] - cos 5 = 0
2 * 1/2 * cos 5 - cos 5 = 0
cos 5 - cos 5 = 0
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Решение:
sin 25 + sin 35 - cos 5=0
(sin 25 + sin 35) - cos 5=0
[ 2 * sin (35+25)/2 * cos(35-25)/2 ] - cos 5 = 0
[ 2*sin 30 * cos 5] - cos 5 = 0
2 * 1/2 * cos 5 - cos 5 = 0
cos 5 - cos 5 = 0