[" 7.If "a=cos3" and "b=sin8" then "],[[" 1) "a>0,b>0," 2) "ab<0," 3) "a>b," 4) "ab>0]]

If a=cos3 and b=sin8 then 1)a>0,b>0 2) ab b 4) ab>0

If a=sin3-sin3^(@) and b=cos3-cos3^(@) then

If A=6 sin20^(@) - 8 sin^(3) 20^@ , B= 8 cos^(3) 20^(@)-6 cos 20^(@) and C= ( sin 3 theta )/( sin theta ) - ( cos 3 theta )/( cos theta ) then

8 sin theta * cos theta * cos 2 theta * cos 4 theta = A) sin 4 theta B) sin 8 theta C) sin 16 theta D) cos 8 theta

sin 7 theta * sin theta+sin11theta * sin 3theta= A) sin 4 theta * sin 10theta B) cos 4 theta * cos 10 theta C) sin 8 theta * sin 4 theta D) cos 8 theta * cos 14 theta

If sqrt2 cos A = cos B + cos^(3) B "and" sqrt2 sin A = sin B - sin^(3) B, "then the value of" sin (A - B) "will be"

If sin A + sin^(2)A + sin^(3)A =1 , then , prove that cos^(6) A - 4 cos^(4) A + 8 cos^(2) A =4 .

If a sin^(3)x+b cos^(3)x=sin x cos x and a sin x=b cos x then a^(2)+b^(2)=

If a sin^(3)x+b cos^(3)x= sin x cos x and a sin x= b cos x then a^(2)+b^(2)=