Class 11-RD SHARMA-Chapter 7-If A+B= Pi\4, prove that (1+tan A)(1+ tan B)=2, (CotA-1)(CotB-1)=2

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Class 11-RD SHARMA-Chapter 7-Ex 7.1 Example 18, If A+B= Pi\4, prove that (1+tan A)(1+ tan B)=2, (CotA-1)(CotB-1)=2
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I have searched in google and utube also bt at last i got ur vdo nd ys it is very helpful😊
Thanks a lot sir for this explanation 🙇‍♀️
BTW the intro was nice😅

prabhatipradhan
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Thank you sir, and the intro was sick tho.😎

swiftness
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Sir a lot thanks to u
All other video don't have the clear steps ❤❤❤❤

amrithananthprasanth
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Sir where can I find the trick of adding 1 on both side video

DHANUSHLAL.V-pmbg