Question

solve the above question

Answer 1

Sin^2phi/a=Cos^2phi/b= k || SAY...¬¬i
sin^2phi =ak
cos^2phi =bk
Sin^2+cos^2/a+b=k ||.... ¬¬ii
sin^2=a/a+b and cos^2=b/a+b
Now,
sin^8/a^3+cos^8/b^3
= (sin^2)^4/a^3+(cos^2)^4/b^3
Now put the values of sin^2 and cos^2
HENCE PROVED