**Mathematics**

#
Two angles forming a linear pair are .

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**Asked in: **Mathematics - Lines and Angles

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View AnswerA,B,C are the interior angles of triangle ABC, then prove that $$\cos ec\left( {\frac{{c + a}}{2}} \right) = \sec \left( {\frac{B}{2}} \right)$$

**Asked in: **Mathematics - Lines and Angles

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**A.**Greater than zero but less than $$\displaystyle { 90 }^{ o }$$ -
**B.**Greater than $$\displaystyle { 90 }^{ o }$$ but less than $$\displaystyle { 180 }^{ o }$$ -
**C.**Greater than $$\displaystyle { 180 }^{ o }$$ but less than $$\displaystyle { 360 }^{ o }$$ -
**D.**Equal to $$\displaystyle { 360 }^{ o }$$

**Asked in: **Mathematics - Lines and Angles

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