[" 20."(1+Delta)(1-grad)=],[" (A) "0],[" (C) "Delta-grad],[" [With usual symbols] "]

If Delta_1=|(1,0),(a,b)| and Delta_2=|(1,0),(c,d)| , then Delta_2Delta_1 is equal to :

If Delta_1=|(1,0),(a,b)| and Delta_2=|(1,0),(c,d)| , then Delta_2Delta_1 is equal to :

In DeltaABC , if 2 cos ((A-C)/2) = (a+c)/sqrt(a^2 -ac+c^2) [Note: All symbols used have their usual meaning in triangle ABC]

In an equilateral triangle ABC ,the ratio (R+4r)/(2R-r) has the value (symbols have usual meanings)

In a DeltaABC, if a=13, b=14and c=15, then angle A is equal to (All symbols used have their usual meaning in a triangle.)

In a DeltaABC, if a=13, b=14and c=15, then angle A is equal to (All symbols used have their usual meaning in a triangle.)

In a DeltaABC, if a=13, b=14and c=15, then angle A is equal to (All symbols used have their usual meaning in a triangle.)

" Let "a,b,c" are the sides of "a" triangle "ABC" and "are" in "A" .P."(" Arithmetic Progression). " . " If "altmin{b,c}" then cosA may be equal to [Note: All symbols used have their usual meaning in triangle "ABC"

In a triangle ABC, if b=(sqrt(3)-1)a and /_C=30^(@), then the value of (A-B) is equal to(All symbols used have usual meaning in a triangle..

In a triangle ABC, if a=13,b=14 and c=15, then angle A is equal to (All symbols used have their usual meaning in a triangle.)