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Earn +20 ptsQ: What is the sin of 2 pie?
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What is sin pie divided by six equals one half?
Sin(pi/6) = 1/2 is a true statement [not pie].
What is sine of 3 pie divided by 4?
0.75
What is the sin of pie over 9?
1/3
What does sin pie over three equal?
one half
How do you prove this trigonometric relationship sin3A equals 3sinA cos 2 A - sin 3 A?
sin(3A) = sin(2A + A) = sin(2A)*cos(A) + cos(2A)*sin(A)= sin(A+A)*cos(A) + cos(A+A)*sin(A) = 2*sin(A)*cos(A)*cos(A) + {cos^2(A) - sin^2(A)}*sin(A) = 2*sin(A)*cos^2(A) + sin(a)*cos^2(A) - sin^3(A) = 3*sin(A)*cos^2(A) - sin^3(A)
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