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Introduction to Trigonometry

Short Answer Type

61. Express sin 84° + tan 59°, in terms of trigonometric ratio of angle between 0° and 45°.

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62. In ΔABC, write cos

fraction numerator straight B plus straight C over denominator 2 end fraction

in terms of angle A.

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63. Express tan A in terms of sin A.

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64. Without using trigonometric tables, evaluate:

fraction numerator 7 space cos space 70 degree over denominator 2 space sin space 20 degree end fraction plus 3 over 2 fraction numerator space cos 55 degree. cosec 35 degree over denominator tan space 5 degree. space tan 45 degree. space tan 85 degree. space tan 65 degree end fraction

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65. If sin θ = cos θ, then write the value of θ. 0°<θ<90°.

sin θ = cos θ
⇒ cos (90-θ) = cos θ
⇒90-θ = θ
⇒2θ = 90 ⇒ θ = 45°.

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66. Write the value of 3 cos 52°. cos 38° - 3 sin 52°. sin 38°.°°

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67. Write the simplest value of

sinθ over cosecθ plus cosθ over secθ.

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68.

In right ABC, right-angled at B. AB = 5 cm and ∠ACB = 30°. Determine the length of the sides BC and AC.

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69. Evaluate:

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70. Evaluate:

<pre>uncaught exception: <b>mkdir(): Permission denied (errno: 2) in /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php at line #56mkdir(): Permission denied</b><br /><br />in file: /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php line 56<br />#0 [internal function]: _hx_error_handler(2, 'mkdir(): Permis...', '/home/config_ad...', 56, Array) #1 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php(56): mkdir('/home/config_ad...', 493) #2 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/FolderTreeStorageAndCache.class.php(110): com_wiris_util_sys_Store->mkdirs() #3 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(231): com_wiris_plugin_impl_FolderTreeStorageAndCache->codeDigest('mml=<math xmlns...') #4 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/TextServiceImpl.class.php(59): com_wiris_plugin_impl_RenderImpl->computeDigest(NULL, Array) #5 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/service.php(19): com_wiris_plugin_impl_TextServiceImpl->service('mathml2accessib...', Array) #6 {main}</pre>

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