標題:

Maths Problem

發問:

1) Find the measures of x in each of the following. cos(40-3x)=sin(7x+2) NEED STEP,PLZ!!!

最佳解答:

cos(40-3x)=sin(7x+2) cos(40-3x)=cos[90-(7x+2)] cos(40-3x)=cos(88-7x) 40-3x=88-7x 4x=48 x=12

其他解答:

1) Find the measures of x in each of thefollowing. Cos(40-3x)=Sin(7x+2) Sol n為整數 Cos(40-3x) =Sin(π/2-40+3x) =Sin[(2n+1)π/2-40+3x] =Sin(7x+2) (2n+1)π/2-40+3x=7x+2 4x=(2n+1)π/2-42 x=(2n+1)π/8-21/2,n為整數

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