Untuk sudut negatif, berlaku hubungan

<img align="middle" alt="begin mathsize 14px style sin left parenthesis negative text α end text right parenthesis equals negative sin text α end text end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»sin«/mi»«mo»(«/mo»«mo»-«/mo»«mtext»§#945;«/mtext»«mo»)«/mo»«mo»=«/mo»«mo»-«/mo»«mi»sin«/mi»«mtext»§#945;«/mtext»«/mrow»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />

Oleh karena itu,&nbsp;

<img align="middle" alt="begin mathsize 14px style sin left parenthesis negative 100 degree right parenthesis equals negative sin 100 degree end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»sin«/mi»«mo»(«/mo»«mo»-«/mo»«mn»100«/mn»«mo»§#176;«/mo»«mo»)«/mo»«mo»=«/mo»«mo»-«/mo»«mi»sin«/mi»«mn»100«/mn»«mo»§#176;«/mo»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />&nbsp;

Jadi, sudut senilai dari&nbsp;<img align="middle" alt="begin mathsize 14px style sin left parenthesis negative 100 degree right parenthesis end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»sin«/mi»«mo»(«/mo»«mo»-«/mo»«mn»100«/mn»«mo»§#176;«/mo»«mo»)«/mo»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />&nbsp;adalah <img align="middle" alt="begin mathsize 14px style negative text sin end text 100 degree end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mo»-«/mo»«mtext»sin«/mtext»«mn»100«/mn»«mo»§#176;«/mo»«/mrow»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />.<img align="middle" alt="space" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»§#160;«/mo»«/math»" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAFCAYAAABirU3bAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAEx0lWhwAAAAxJREFUeNpjYKABAAAAVQAB8vOvGAAAAE50RVh0TWF0aE1MADxtYXRoIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8xOTk4L01hdGgvTWF0aE1MIj48bW8+JiN4QTA7PC9tbz48L21hdGg+SHplFQAAAABJRU5ErkJggg==" style="max-width: none;" />&nbsp;

Nyatakan <img align="middle" alt="begin mathsize 14px style sin left parenthesis negative 100 degree right parenthesis end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»sin«/mi»«mo»(«/mo»«mo»-«/mo»«mn»100«/mn»«mo»§#176;«/mo»«mo»)«/mo»«/mrow»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />&nbsp;dalam sudut senilai!<img align="middle" alt="space" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»§#160;«/mo»«/math»" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAFCAYAAABirU3bAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAEx0lWhwAAAAxJREFUeNpjYKABAAAAVQAB8vOvGAAAAE50RVh0TWF0aE1MADxtYXRoIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8xOTk4L01hdGgvTWF0aE1MIj48bW8+JiN4QTA7PC9tbz48L21hdGg+SHplFQAAAABJRU5ErkJggg==" style="max-width: none;" />&nbsp;

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