If in a ` A B C , =a^2-(b-c)^2,` then `tanA` is equal to `15//16` b. `8//15` c.`8//17` d. `1//2`

If A:B=3:4, B:C=8:9, C:D=15:16 then A:D is equal to ?

If A : B : C=2:3:4, then the ratio A/B : B/C : C/A is equal to 4:9: 16 b. 8:9: 24 c. 8:9: 12 d. 8:9: 16

If a=-2 , b=-1 ,then a^(b)-b^(a) is equal to a) -1 b) 0.5 c) -2 d) -1.5

In a triangle A B C ,\ (a^2-b^2-c^2)tanA+(a^2-b^2+c^2)tanB is equal to (a^2+b^2-c^2)tanC (b) (a^2+b^2+c^2)tanC (b^2+c^2-a^2)tanC (d) none of these

In a triangle A B C ,\ (a^2-b^2-c^2)tanA+(a^2-b^2+c^2)tanB is equal to (a^2+b^2-c^2)tanC (b) (a^2+b^2+c^2)tanC (b^2+c^2-a^2)tanC (d) none of these

If a = - 2 , b = -1 , then ( a^b - b^a ) is equal to ( a ) -1 ( b ) 0.5 ( c ) -2 ( d ) -1.5

.^18C_15+2(.^18C_16)+^17C_16+1=^nC_3 , then n is equal to

If in triangle A B C ,sumsin(A/2)=6/5a n dsumI I_1=9 (where I_1,I_2 a n d I_3 are excenters and I is incenter, then circumradius R is equal to (15)/8 (b) (15)/4 (c) (15)/2 (d) 4/(12)

If in triangle A B C ,sumsin(A/2)=6/5a n dsumI I_1=9 (where I_1,I_2 a n d I_3 are excenters and I is incenter, then circumradius R is equal to (15)/8 (b) (15)/4 (c) (15)/2 (d) 4/(12)