Sagot :
Adım adım açıklama:
• tan 15=a
• cot 15=1/a
[tex]\frac{1}{1-a} + \frac{1}{-1 a} = \frac{1}{1-a} + \frac{1}{a-1/a} \\\\= \frac{1}{1-a} + \frac{a}{a-1} \\\\= \frac{1}{1-a} \frac{-a}{1-a} \\\\= \frac{1-a}{1-a} \\\\=1[/tex]
-Kolay Gelsin
#1905
Cevap:
1
Adım adım açıklama:
tan15 = sin15/cos15
cot15 = sin15/cos15
[tex]\frac{1}{1-\frac{sin15}{cos15} } +\frac{1}{1-\frac{cos15}{sin15} } = \frac{1}{\frac{cos15-sin15}{cos15} }+\frac{1}{\frac{sin15-cos15}{sin15} } = \frac{cos15}{cos15 - sin15}+ \frac{sin15}{sin15-cos15}\\\\= \frac{cos15}{cos15 - sin15} - \frac{sin15}{cos15-sin15}=\frac{cos15 - sin15}{cos15-sin15}=1[/tex]
Son basamakta ikinci kesirin payını ve paydasını (-) ile çarparak düzenledim.
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