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mariapetrovaa
@mariapetrovaa
July 2022
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ВЫЧИСЛИТЕ Значение выражения cos 6п/5 *cos 7п/10+ sin 6п/5* sin 7п/10
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uekmyfhfp
Cos a* cosb + sin a*sinb = cos(a- b);
cos 6п/5 *cos 7п/10+ sin 6п/5* sin 7п/10 = cos( 6
π/ 5 - 7π/10) =
= cos( 12π/10 - 7π/10) = cos( 5π/10) = cos(π/2) = 0
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Answers & Comments
cos 6п/5 *cos 7п/10+ sin 6п/5* sin 7п/10 = cos( 6π/ 5 - 7π/10) =
= cos( 12π/10 - 7π/10) = cos( 5π/10) = cos(π/2) = 0