√2sin(x-π/4)+√6cos(x-π/4)化简

39046632 1年前 已收到3个回答 举报

lxxf 春芽

共回答了12个问题采纳率:83.3% 举报

√2sin(x-π/4)+√6cos(x-π/4)
=2√2[(1/2)sin(x-π/4)+(√3/2)cos(x-π/4)]【提√(a²+b²)】
=2√2[sin(x-π/4)cos(π/3)+cos(x-π/4)sin(π/3)]
=2√2sin(x-π/4+π/3)
=2√2sin(x+π/12)
【如果熟悉辅助角公式更简单:asinα+bcosα=√(a²+b²)sin(α+φ),其中tanφ=b/a】

1年前

8

ccf_jcc 幼苗

共回答了1576个问题 举报

答:
√2sin(x-π/4)+√6cos(x-π/4)
=2√2*[(1/2)sin(x-π/4)+(√3/2)cos(x-π/4)]
=2√2*sin(x-π/4+π/3)
=2√2*sin(x+π/12)

1年前

0

yxjht9098 幼苗

共回答了231个问题 举报

√2sin(x-π/4)+√6cos(x-π/4)
=2√2[(1/2)sin(x-π/4)+(√3/2)cos(x-π/4)]
=2√2[sin(x-π/4)cos(π/3)+cos(x-π/4)sin(π/3)]
=2√2sin(x-π/4+π/3)
=2√2sin(x+π/12)

1年前

0
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