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if cos 9a =sina and 9a <90' , then find the value of tan5a is

Posted by Prem Parkash 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Lipsa Rani 7 years, 7 months ago

Cos 9a =sin a,sin (90-9a)=sina,90-9a=a,90=10a,a=9 so,tan 5×9=tan 45=1

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CBSE > Class 10 > Mathematics