please answer this question.
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sayeem786:
how?
a-b + a + b = 2a
Use sin ( A + B ) formula
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Hope, you understand
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no sin(A+B)=SinAcosB-cosAsinB
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wait... theta =7.5deg=15/2
sin8theta=sin8x15/2=sin60=√3/2
sin6theta=sin6x15/2=sin45=1/√2
sin3theta=sin3x15/2=sin45/2=0.38
sin4theta=sin4x15/2=sin30=1/2
cos7.5=0.99
cos2x15/2=cos15=0.96
cos3x7.5=cos22.5=0.92
let's substitute all,
=(√3/2 X 0.99)-(1/√2x0.92) / (0.96x0.99)-(0.38x1/2)
=(0.85-0.65)/(0.95-0.19)
=0.20/0.76
=0.26
it's ur answer..... thnx Fr seeing my answer
sin8theta=sin8x15/2=sin60=√3/2
sin6theta=sin6x15/2=sin45=1/√2
sin3theta=sin3x15/2=sin45/2=0.38
sin4theta=sin4x15/2=sin30=1/2
cos7.5=0.99
cos2x15/2=cos15=0.96
cos3x7.5=cos22.5=0.92
let's substitute all,
=(√3/2 X 0.99)-(1/√2x0.92) / (0.96x0.99)-(0.38x1/2)
=(0.85-0.65)/(0.95-0.19)
=0.20/0.76
=0.26
it's ur answer..... thnx Fr seeing my answer
Then, (cos^2(a) - sin^2(a))(cos^2(a)+sin^2(a))+1 = cos(2a)*1 +1 = 2cos^2(a)
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