Without using trignometrical tables , evaluate: sin 23°cos27°cot45°sec67°cosec63°
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Answer:
sin23°×cos27°×1×sec(90°-23)×cosec(90°-27°
=sin23°×cos27°×cosec23°×sec27°
=sin23°×Cos27°×1/sin23°×1/cos27°
=1
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=> 1
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