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5 521September 04, 18:43
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September 03, 14:16
Vektor mavzusi yaxshi berilgan kitob.
September 03, 03:27
tga-ctga=-2ctg2a
tg1 - ct1 + ctg1 +2tg2+4tg4+8tg8+16tg16+32tg58=
-2ctg2+ctg1+ 2tg2+4tg4+8tg8+16tg16+32tg58=
-4ctg4+ctg1+4tg4+8tg8+16tg16+32tg58= -8ctg8+8tg8+ctg1+16tg16+32tg58=-16ctg16+ctg1+16tg16+32tg58= -32ctg32+32tg58+ctg1 =
-32ctg32+32tg(90-32)+ctg1 =
-32ctg32+32ctg32+ctg1=ctg1
Javob A)
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