Question

solve mathematics questions​

Answer 1

Answer:

please send better version of photo

Answer 2

Answer:

(√3 - 1)/ 2√2

Step-by-step explanation:

Cos75 = Cos(30 + 45)

Using identity {Cos(a + b) = cosa × cosb - sina × sinb}

Cos(30 + 45) = cos30cos45 - sin30sin45

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