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1.sin3A=cos(A-10°)
cos(90°-3A)=cos(A-10°)
90°-3A=A-10°
100°=4A
A=25°
2.for unique solution a1/a2is not=b1/b2
here,a1=k ,a2=6
b1=-1,b2=-2
so,k/6is not =-1/-2
-2k=-6
k=3
3.kx^2+3x+k=0
k(2)^2+3×2+k=0
4k+6+k=0
5k=-6
k=-6/5
4.
cos(90°-3A)=cos(A-10°)
90°-3A=A-10°
100°=4A
A=25°
2.for unique solution a1/a2is not=b1/b2
here,a1=k ,a2=6
b1=-1,b2=-2
so,k/6is not =-1/-2
-2k=-6
k=3
3.kx^2+3x+k=0
k(2)^2+3×2+k=0
4k+6+k=0
5k=-6
k=-6/5
4.
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