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Relació fonamental
bold sin to the power of bold 2 bold alpha bold space bold plus bold space bold cos to the power of bold 2 bold alpha bold space bold equals bold 1

Se'n dedueix que:

begin mathsize 12px style sin straight alpha bold space bold equals bold space bold plus-or-minus square root of bold 1 bold minus bold cos to the power of bold 2 bold alpha end root cos straight alpha bold equals bold plus-or-minus square root of bold 1 bold minus bold sin to the power of bold 2 bold alpha end root end style

Calculadora: si cosα = 0,5 cal escriure: square root of blank end root open parentheses 1 minus 0.5 squared close parentheses

Es recorda que:

begin mathsize 12px style tg straight alpha bold space bold equals bold space fraction numerator sin straight alpha over denominator cos straight alpha end fraction end style
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