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For input arguments val in the ranges: (1.0, Inf], [-Inf, -1.0) and NaN, acos(val) returns NaN.

Examples

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float $t;

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float $acos_of_t; 

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float $cos_of_acos_of_t;

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// acos(0) is 90 degrees because cos(90 degrees) = 0

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$t                = 0.0;

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$acos_of_t        = acos($t);

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$cos_of_acos_of_t = cos($acos_of_t);

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print("t, acos(t), cos(acos(t)) = " + string($t) + ", " + string($acos_of_t) + ", " + string($cos_of_acos_of_t));

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// 1.1 is not a meaningful input into acos and returns NaN 

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// (-1.#IND00)

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$t                = 1.1;

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$acos_of_t        = acos($t);

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$cos_of_acos_of_t = cos($acos_of_t);

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print("t, acos(t), cos(acos(t)) = " + string($t) + ", " + string($acos_of_t) + ", " + string($cos_of_acos_of_t));

Additional info

Related commands

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