buktikan (cos A cos B - sin A sin B )kuadrat + (cos A sin B + sin A cos B)kuadrat = 1 tolong bantu ya

Question

Matematika Diposting : 2017-11-12 Diupdate : 2017-12-02 SheilaBerylivia1

Pertanyaan

buktikan (cos A cos B - sin A sin B )kuadrat + (cos A sin B + sin A cos B)kuadrat = 1
tolong bantu ya

Answer 1

[tex]\cos^2(A+B)+\sin^2(A+B)=1 ~~\blacksquare[/tex]

cat:
[tex]\boxed{\cos^2x+\sin^2x=1}[/tex]