Question

1.2 Simplify WITHOUT the use of a calculator: 1.2.1 \[ \frac{\cos \left(90^{\circ}+x\right) \cdot \sin \left(180^{\circ}+x\right)}{\tan 225^{\circ}-\cos ^{2}(-x)} \] 1.2 .2 \[ \frac{\sin 210^{\circ} \cdot \cos 790^{\circ} \cdot \tan \left(-330^{\circ}\right)}{\sin 160^{\circ}} \] 1.3 Prove that; \( \quad \frac{1}{\tan x}+\frac{\sin x}{1+\cos x}=\frac{1}{\sin x} \) (5) 1.4 Determine the general solution of \( 2 \cos 2 x=-0,44 \)

          1.2 Simplify WITHOUT the use of a calculator:
1.2.1
\[
\frac{\cos \left(90^{\circ}+x\right) \cdot \sin \left(180^{\circ}+x\right)}{\tan 225^{\circ}-\cos ^{2}(-x)}
\]
1.2 .2
\[
\frac{\sin 210^{\circ} \cdot \cos 790^{\circ} \cdot \tan \left(-330^{\circ}\right)}{\sin 160^{\circ}}
\]
1.3 Prove that; \( \quad \frac{1}{\tan x}+\frac{\sin x}{1+\cos x}=\frac{1}{\sin x} \)
(5)
1.4 Determine the general solution of \( 2 \cos 2 x=-0,44 \)