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If xcosA/a+ ysinA/b=1 and xsinA/a- ycosA/b=-1 prove that x​​​​​​2/a​​​​​​2+y​​​​​​2/ b 2=2 ​​

Answer» If xcosA/a+ ysinA/b=1 and xsinA/a- ycosA/b=-1
prove that x​​​​​​2/a​​​​​​2+y​​​​​​2/ b 2=2
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