Question

Помогите пж, даю 15 баллов ​

Answer 1

$\displaystyle\bf\\1)\\\\Cos\Big(\frac{3\pi }{2} -\alpha \Big)-Sin\Big(2\pi -\alpha \Big)=-Sin\alpha -(-Sin\alpha)=\\\\=-Sin\alpha +Sin\alpha =0\\\\\\2)\\\\1-Cos^{2} \Big(\frac{\pi }{2}-\alpha \Big)=1-Sin^{2} \alpha =Cos^{2} \alpha$