Triqonometriyanın əsas düsturları
Triqonometriyanın əsas düsturları:
- Failed to parse (lexing error): \cos (a+b)= \cos a \cdot \cos b – \sin a \cdot \sin b \,
- Failed to parse (lexing error): \sin (a-b)= \sin a \cdot \cos b – \cos a \cdot \sin b \,
- Failed to parse (lexing error): \tan (a-b) = \frac{\tan a – \tan b}{1+ \tan a\cdot \tan b}\ \,
- Failed to parse (lexing error): \cos 2a= \cos^2 a – \sin^2 a=2 \cos^2 a -1= 1 – 2 \sin^2 a \,
- Failed to parse (lexing error): \cos a – \cos b=-2 \sin\frac{ a+b }{ 2 }\cdot \sin\frac{ a-b }{2}\ \,
- Failed to parse (lexing error): \sin a – \sin b=2 \cos \frac{ a+b }{ 2 }\cdot \sin\frac{ a-b }{2}\ \,
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