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14)4sin^2(A)=1
sin^2(A)=1/4
sin(A)=1/2. A=30°
tan^2(30)+cos^2(30)
=13/12
12)cos(x+y)=1/2
sin(x-y)=1/2
if sinx=cosy
then
x+y=90
2x=90. x=45. y=15
sin^2(A)=1/4
sin(A)=1/2. A=30°
tan^2(30)+cos^2(30)
=13/12
12)cos(x+y)=1/2
sin(x-y)=1/2
if sinx=cosy
then
x+y=90
2x=90. x=45. y=15
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