a^(4)-b^(4)

If tantheta=sqrt(a/b) where a , b are positive reals then the value of sinthetasec^7theta+costheta cosec^7theta is- a. ((a+b)^3(a^4+b^4))/((a b)^(7//2)) b. ((a+b)^3(a^4-b^4))/((a b)^(7//2)) c. ((a+b)^3(b^4-a^4))/((a b)^(7//2)) d. ((a+b)^3(a^4+b^4))/((a b)^(7//2))

Fractorise: 9a^(2) -b ^(2)+4b-4

Expand {(a+b)^(4) + (a-b)^(4)} and use it to evalute

Evaluate : (ii) ((4)/(7) a+ (3)/(4) b) ((4)/(7) a - (3)/(4) b)

3a^7-b-81a^4b^4

Find (a+b)^4-(a-b)^4 .

If a/(4-a)+b/(4-b)+c/(4-c)=1 prove that 1/(4-a)+1/(4-b)+1/(4-c)=1