Question

ولا,11,اول
12. Evaluate [cosOº + sin 45° + sin30°)(sin 90D - cos 45º -f cos 60°). .
13.
20​

Answer 1

Answer:

Hope it's helpful for you

Step-by-step explanation:

$cos \: 0 \: = \frac{1}{2} \: sin45 = \frac{1}{ \sqrt{2} } sin30 = \frac{1}{2}$

$sin90 = 1 \: cos \: 45 = \frac{1}{ \sqrt{2} }$

$= > (1 + \frac{1}{ \sqrt{2} } + \frac{1}{2})(1 - \frac{1}{ \sqrt{2} } + \frac{1}{2} )$

$= > ( \frac{3} {2})^{2} - ( \frac{1}{ \sqrt{2} })$

$= > \frac{9}{4} - \frac{1}{2}$

$= > \frac{9 - 2}{4}$

$= > \frac{7}{4}$

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