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RonnyDeKoning
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|dw:1353250334560:dw|
Skaematik
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i can't read it
rizwan_uet
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RonnyDeKoning
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Sin 7,5° * sin 37,5 ° * sin 52,5° * sin 82,5°
rizwan_uet
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use calculator
RonnyDeKoning
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That is the point, you may not.
gohangoku58
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sin (90-x)=cos x, sin 2a = 2 sin a cos a
Sin 7,5° * sin 37,5 ° * sin 52,5° * sin 82,5° = 1/4(2sin 7.5 cos 7.5 * 2 sin37.5 cos 37.t )
= 1/4(sin 15 sin 75)
=1/8(2sin 15 cos 15)
=1/8(sin 30)
=1/16
RonnyDeKoning
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Why do you use 1/4?
gohangoku58
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coz i need 2 in 2sin a cos a
twice
so i multiply and divide by 4
RonnyDeKoning
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How do oyu get to sin 15? and sin 75?
gohangoku58
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sin 52.5 = sin(90-37.5) = cos 37.5
sin 82.5 = sin(90-87.5) = cos 7.5
2 sin 7.5 cos 7.5 = sin 15
same for sin 75