2 a bit nicer to read
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Can we To which extent can one take ideas from GPL programs under GPL in developing anya commercial app?

I am developing a commercial application. There are several GPL programs under GPL which have some common features with my planned applications. 

Can I take an ideaideas from those GPL applications under GPL and implement them myself without copying the code. Does?

Would this violate the GPL.?

Can we take ideas from GPL programs in developing any commercial app

I am developing a commercial application. There are several GPL programs which have some common features with my applications. Can I take an idea from those GPL applications and implement them myself without copying the code. Does this violate GPL.

To which extent can one take ideas from programs under GPL in developing a commercial app?

I am developing a commercial application. There are several programs under GPL which have some common features with my planned applications. 

Can I take ideas from those applications under GPL and implement them myself without copying the code?

Would this violate the GPL?

1
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Can we take ideas from GPL programs in developing any commercial app

I am developing a commercial application. There are several GPL programs which have some common features with my applications. Can I take an idea from those GPL applications and implement them myself without copying the code. Does this violate GPL.