化简:4√2cosα+3√2sinα
问题描述:
化简:4√2cosα+3√2sinα
答
4√2cosα+3√2sinα=√2(4cosα+3sinα)=5√2[(4/5)cosα + (3/5)sinα]令:sinβ = 4/5,且 β ∈(0,π/2),则:cosβ = 3/5因此:β = arcsin(4/5)∴4√2cosα+3√2sinα=√2(4cosα+3sinα)=5√2[(4/5)cos...