Leosesok
5 год назад
Найдите значения выражения Sin(π/4+х)+2Sin(π/4-х)+4Cosх+2Cos*(х+3π/4)
при:
1)х = π/4; -дробь.
2)х = 3π/4. -дробь.
ОТВЕТЫ
Nilovich
Jun 30, 2019
1
Sin(π/4+π/4)+2sin(π/4-π/4)+4cosπ/4+2cos(π/4+3π/4)=
=sinπ/2+2sin0+4cosπ/4+2cosπ=1+2*0+4*√2/2+2*(-1)=1+0+2√2-2=2√2-1
2
sin(π/4+3π/4)+2sin(π/4-3π/4)+4cos3π/4+2cos(3π/4+3π/4)=
=sinπ+2sin(-π/2)-4cosπ/4+2cos3π/2=0+2*(-1)-4*√2/2+2*0=-2-2√2
Sin(π/4+π/4)+2sin(π/4-π/4)+4cosπ/4+2cos(π/4+3π/4)=
=sinπ/2+2sin0+4cosπ/4+2cosπ=1+2*0+4*√2/2+2*(-1)=1+0+2√2-2=2√2-1
2
sin(π/4+3π/4)+2sin(π/4-3π/4)+4cos3π/4+2cos(3π/4+3π/4)=
=sinπ+2sin(-π/2)-4cosπ/4+2cos3π/2=0+2*(-1)-4*√2/2+2*0=-2-2√2
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