[" In a "/_ABC," if "A=(4 pi)/(9)" and "B=(2 pi)/(9)," then "a^(2)-b^(2)" is equal to "],[[" (A) "c^(2)," (B) be "],[" (C) "ab," (D) "c" a "]]

In a Delta ABC, if A=(4 pi)/(9) and B=(2 pi)/(9), then a^(2)-b^(2) is equal to

" In "/_ABC,a=7,b=2,B=(pi)/(4)" then "

In a triangle ABC if A-B=(pi)/(2) , then C+2B is equal to

In a /_ABC/_A=(pi)/(2) then cos^(2)B+cos^(2)C=

tan^6(pi/9)-33tan^4(pi/9)+27tan^2(pi/9) is equal to

If sin A=(3)/(5) and cos B=(9)/(41),0

"tan"^(6) (pi)/(9)-33 "tan"^(4)(pi)/(9) +27 "tan"^(2)(pi)/(9)=

[" If "I=(2)/(pi)int_((-pi)/(4))^((pi)/(4))(dx)/((1+e^(sin x)))" then "9I^(2)=--],[[" (A) "(9)/(4),],[" (B) "9],[" (C) "(pi^(2))/(4)],[" (D) "(9 pi^(2))/(4)]]

If in a triangle ABC , a= 5 , b=4 , A = (pi)/(2) +B, then C:

In triangle ABC,/_C=(2 pi)/(3) then the value of cos^(2)A+cos^(2)B-cos A*cos B is equal