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Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

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Appendix I / Utilities / Trigonometrical Functions<br />

_ _<br />

SIN_F AND SIN_G ERRORS<br />

x 10-4<br />

2.5<br />

2<br />

1.5<br />

1<br />

0.5<br />

0<br />

-0.5<br />

-1<br />

-1.5<br />

22.11.2 Cosine Approximation<br />

-2<br />

SIN_F (SOLID)<br />

SIN_G (DASHED)<br />

-2.5<br />

0 20 40 60 80 100 120 140 160 180<br />

ANGLE (DEGREES)<br />

Figure 22-10 : Sine Function Errors<br />

COS_F takes an angle (XI) in the range [-2π , 2π] and returns its cosine<br />

value in the range [-1 , 1].<br />

−1<br />

( X ) : = ( X + 2 ⋅ π )<br />

y : = COS_F<br />

SIN_F<br />

I<br />

Equation 22.11-8<br />

COS_G provides a more accurate approximation that in turn invokes SIN_G.<br />

ND COS_G ERRORS<br />

x 10-4<br />

2.5<br />

2<br />

1.5<br />

1<br />

0.5<br />

0<br />

05<br />

Figure 22-11 : Cosine Function Errors<br />

22.11-2<br />

I

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