मूल्यांकन कीजिए -
`cos(cot^(-1).(15)/(8))`.

Evaluate each of the following: cos(cot^(-1)(15)/8) (ii) cos(sec^(-1)5/3) (iii) cos("c o s e c"^(-1)(13)/(12))

Cot^(-1)(4/3)-Cot^(-1)(15/8)=

cot^(-1)(21) +cot^(-1)(13)+co^(-1)(8)=

(cot^(2)15^(@)-1)/(cot^(2)15^(@)+1)=?

Show that sin ^ (- 1) ((sin (3 pi)) / (7)) + cos ^ (- 1) ((cos (46 pi)) / (7)) + tan ^ (- 1) (- (tan (13 pi)) / (8)) + cot ^ (- 1) (cot (- (19 pi) / (8))) = (13 pi) / (7)

The value of sin^(-1)(sin((47 pi)/(7)))+cos^(-1)cos((60 pi)/(7))+tan^(-1)(-(tan)(29 pi)/(8))+cot^(-1)(cot(-(35 pi)/(8)))

Prove that: cos ((2 pi) / (15)) * cos ((4 pi) / (15)) * cos ((8 pi) / (15)) * cos ((16 pi) / (15)) = (1) / (16)

(cot^2 15^@-1)/(cot^2 15^@+1)=