Mathematics: Use the given information to find the exact value of the expression. sin α =21/29 , α lies in quadrant iv, and cos β =-4/11 , β lies in quadrant iii find cos(α+β).

Use the given information to find the exact value

Ответ:

lananamr

06.01.2022

Hello,

sin α =21/29 and α lies in quadrant IV ==>cos α =√(1²-(21/29)²)=20/29.

cos β =-4/11 , β lies in quadrant III ==> sin β =-√(1²-(4/11)²)=-√105 /11

cos(α+β)=cos α cos β- sin α sin β
=20/29*(-4/11)+21/29*√105 / 11
=(-80+21√105)/(11*29)

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Ответ:

madeleine1102

24.04.2021

Mathematics

Congruent

Step-by-step explanation:

I copied and paste it on google and it said congruent :)

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Use the given information to find the exact value of the expression.

sin α =21/29 , α lies in quadrant iv, and cos β =-4/11 , β lies in quadrant iii find cos(α+β).

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