" 9If "k=tan25^(@)" then "(k-1)/(k+1)+(k+1)/(k-1)=

If A+B+C=pi&sin(A+(C)/(2))=k(sin C)/(2), then (tan A)/(2)(tan B)/(2)= a.(k-1)/(k+1) b.(k+1)/(k-1) c.(k)/(k+1) d.(k+1)/(k)

If (sin x)/(a)=(cos x)/(b_(k))=(tan x)/(c)=k, then bc+(1)/(ck)+(ak)/(1+bk) is equal to k(a+(1)/(a)) (b) 1/k(a+(1)/(a))(1)/(k^(2))(d)(a)/(k)

If t a ntheta_1t a ntheta_2=k , then ("cos"(theta_1-theta_2))/("cos"(theta_1+theta_2))= a. (1+k)/(1-k) b. (1-k)/(1+k) c. (k+1)/(k-1) d. (k-1)/(k+1)

If tantheta_1=kcottheta_2, then find cos(theta_1-theta_2)/cos(theta_1+theta_2)= ................ A) (1+k)/(1-k) B) (1-k)/(1+k) C) (k+1)/(k-1) D) (k-1)/(k+1)

sum_(k =1)^(n) k(1 + 1/n)^(k -1) =

If (k+(1)/(k))^(2)=16 , then k^(2)+(1)/(k^(2))=

If an angle alpha is divided into two parts A&B such that A-B=x and tan A:tan B=k:1 Then the value of sin x is (A) (k+1)/(k-1)sin alpha (k)/(k+1)sin alpha (C) (k-1)/(k+1)sin alpha (D) tan alpha

Two consecutive irreversible fierst order reactions can be represented by Aoverset(k_(1))(rarr)Boverset(k_(2))(rarr)C The rate equation for A is readily interated to obtain [A]_(t)=[A]_(0).e^(-k_(1^(t))) , and [B]_(t)=(k_(1)[A]_(0))/(k_(2)-k_(1))[e^(-k_(1)(t))-e^(-k_(2)(t))] At what time will B be present in maximum concentration ? a) (K_(1))/(K_(2)-K_(1)) b) (1)/(k_(1)-k_(2) In (k_(1))/(k_(2)) c) (1)/(k_(2)-k_(1)) In (k_(1))/(k_(2)) d) none of these

If in DeltaABC , (cosA)/(7)=(cosB)/(19)=(cosC)/(25)=k , then : |{:(-(1)/(k),25,19),(25,-(1)/(k),7),(19,7,-(1)/(k)):}| equals