Principle of Mathematical Induction

Principle of Mathematical Induction


If tan open parentheses straight x over 2 close parentheses space equals space 3 over 4 comma find the value of:

space space cos space straight x


We know that
             cos 2 straight A space equals space fraction numerator 1 minus tan squared straight A over denominator 1 plus tan squared straight A end fraction
Replacing A byspace space space straight x over 2 comma we get
               <pre>uncaught exception: <b>mkdir(): Permission denied (errno: 2) in /home/config_admin/public/ at line #56mkdir(): Permission denied</b><br /><br />in file: /home/config_admin/public/ line 56<br />#0 [internal function]: _hx_error_handler(2, 'mkdir(): Permis...', '/home/config_ad...', 56, Array)
#1 /home/config_admin/public/ mkdir('/home/config_ad...', 493)
#2 /home/config_admin/public/ com_wiris_util_sys_Store->mkdirs()
#3 /home/config_admin/public/ com_wiris_plugin_impl_FolderTreeStorageAndCache->codeDigest('mml=<math xmlns...')
#4 /home/config_admin/public/ com_wiris_plugin_impl_RenderImpl->computeDigest(NULL, Array)
#5 /home/config_admin/public/ com_wiris_plugin_impl_TextServiceImpl->service('mathml2accessib...', Array)
#6 {main}</pre>
Hence,                  cosx space equals space 7 over 25

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