A.  $\sin 0^{\text{O}}+\cos 0^{\text{O}}=0.$ 

B.  $\sin {90}^{\text{O}}+\cos {90}^{\text{O}}=1.$

C.  $\sin {180}^{\text{O}}+\cos {180}^{\text{O}}=-1.$ 

D.  $\sin {60}^{\text{O}}+\cos {60}^{\text{O}}=\frac{\sqrt{3}+1}{2}.$

A.  $\tan \left(\frac{\mathrm{\pi }}{2}+x\right)=cotx$

B.  $\sin \left(\frac{\mathrm{\pi }}{2}-x\right)=\cos x$

C.  $\sin \left(\frac{\mathrm{\pi }}{2}+x\right)=\cos x$

D.  $\tan \left(\frac{\mathrm{\pi }}{2}-x\right)=cotx$

A.  $\sin {45}^{\text{O}}+\cos {45}^{\text{O}}=\sqrt{2}.$

B.  $\sin {30}^{\text{O}}+\cos {60}^{\text{O}}=1.$

C.  $\sin {60}^{\text{O}}+\cos {150}^{\text{O}}=0.$ 

D.  $\sin {120}^{\text{O}}+\cos {30}^{\text{O}}=0.$

A.  $\int \frac{dx}{ax+b}=\frac{1}{a}\ln \left|ax+b\right|+C\left(a\ne 0\right).$

B.  $\int \frac{dx}{{\sin }^{2}x}=\cot x+C.$

C.  $\int e^{x}dx=e^x+C.$

D.  $\int dx=x+C.$