3 years ago

I ONLY HAVE 5 MIN TO ANSWER PLEASE HELP ME !!!!!!!!!!!

1 answer:

7 0

multiplying two numbers (factors) together will result in the same thing as breaking up one factor into two addends, multiplying both addends by the other factor, and adding together both products

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4 years ago

. If sin(x + y)=sin x.cos y+cos x.sin y, then find the value of sin 75 degrees

miv72 [106K]

Answer:

$\sf \dfrac{\sqrt{6}+\sqrt{2}}{4}$

Step-by-step explanation:

<h3>Trigonometry:</h3>

75 = 45 + 30

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Sin (45 + 30) = Sin 45 * Cos 30 + Cos 45 * Sin 30

$\sf =\dfrac{1}{\sqrt{2}}*\dfrac{\sqrt{3}}{2}+\dfrac{1}{\sqrt{2}}* \dfrac{1}{2}\\\\\\=\dfrac{\sqrt{3}}{2\sqrt{2}}+\dfrac{1}{2\sqrt{2}}\\\\\\=\dfrac{\sqrt{3}*\sqrt{2}}{2*\sqrt{2}*\sqrt{2}}+\dfrac{1*\sqrt{2}}{2\sqrt{2}*\sqrt{2}}\\\\\\=\dfrac{\sqrt{6}}{2*2}+\dfrac{\sqrt{2}}{2*2}\\\\\\=\dfrac{\sqrt{6}+\sqrt{2}}{4}$

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2 years ago