Question

1-CosA/1+CosA .where A=90°.Find​

Answer 1

#SOLUTION

$\frac{1 - \cos(a) }{1 + \cos(a) } \\ = \frac{2 \sin {}^{2} ( \frac{a}{2} ) }{2 \cos {}^{2} ( \frac{a}{2} ) } \\ = ( \frac{ \sin( \frac{a}{2} ) }{ \cos( \frac{a}{2} ) } ) {}^{2} \\ = \tan {}^{2} ( \frac{a}{2} ) \\ = \tan {}^{2} ( \frac{90}{2} ) \\ = \tan {}^{2} (45) = 1 {}^{2} = 1$

Answer 2

Answer:

0

Step-by-step explanation:

1-cosA/1+CosA=Tan2A

Tan180=0

so the answer is 0

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