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19 lines
475 B
JavaScript
19 lines
475 B
JavaScript
/**
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* Convert from sine to cosine
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*
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* |cos(x)| = sqrt(1 - sin(x)^2)
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*
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* @param {BigNumber} value Sine value of x
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* @returns {BigNumber} sine as cosine
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*/
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module.exports = function sinToCos(value) {
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var BigNumber = value.constructor;
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var precision = BigNumber.precision;
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BigNumber.config({precision: precision + 2});
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var ret = BigNumber.ONE.minus(value.times(value)).sqrt();
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BigNumber.config({precision: precision});
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return ret.toDP(precision - 1);
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};
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