सिद्ध कीजिए कि -
`(cot A-1)(cotB-1)=2" यदि "A+B=(pi)/(4)`

cot ^(-1)""x+cot^(-1)""2x=(3pi)/(4)

2cot^(-1)5+cot^(-1)7+2cot^(-1)8=(pi)/(4)

2 cot ^(-1) 5+cot ^(-1) 7 + 2 cot ^(-1) 8=(pi)/(4)

सिद्ध कीजिए कि 2tan^(-1)sqrt((b)/(a))=cos^(-1)((a-b)/(a+b))

i) If A+B=pi/4 prove that: (cotA-1)(cotB-1)=2

i) If A+B=pi/4 prove that: (cotA-1)(cotB-1)=2

If A + B= pi/4 , show that (cot A-1) (cot B-1) =2

If A+B=pi//4 , then prove that (cotA-1)(cotB-1)=2

i) If A+B=pi/4 prove that: (cotA-1)(cotB-1)=2 ii) If tan(picostheta)=cot(pisintheta) , then prove that: cos(theta-pi/4)=1/(2sqrt(2))