Question

please answer this question​

Answer 1

Answer: 1)sin45°=1/√2

2)cos30°=√3/2

3)cot60°=1/√3

4)not sure about it

Hope it helps

Step-by-step explanation:

Answer 2

Answer:

$sin ^{ - 1} ( \frac{1}{ \sqrt{2} } ) = 45 \\ \\ cos { - 1} ( - \frac{ \sqrt{3} }{2} ) = \frac{5\pi}{6}$

${ \ \cot(?) }^{ - 1} ( \frac{1}{ \sqrt{3} } ) = 60 \\ \\ 2 \sin( \alpha ) = \sqrt{3} \tan( \alpha ) \\ \\ then \\ \\ \frac{ \sin( \alpha ) }{ \tan( \alpha ) } = \frac{ \sqrt{3} }{2} \\ \\ or \: \\ \\ \cos( \alpha ) = \frac{ \sqrt{3} }{2} \\ \\ then \\ \\ \alpha = 30$