Datrys sin^{2}20^{circ}+cos^250^circ+sin20^circcos50^circ=3/4

$$\sin ^ { 2 } 20 ^ { \circ } + \cos ^ { 2 } 50 ^ { \circ } + \sin 20 ^ { \circ } \cos 50 ^ { \circ } = \frac { 3 } { 4 }$$

Gwireddu

Camau Ateb

Evaluate trigonometric functions in the problem

$$0.3420201433256687 ^ {2} + 0.6427876096865394 ^ {2} + 0.3420201433256687 \cdot 0.6427876096865394 = \frac{3}{4}$$

Cyfrifo 0.3420201433256687 i bŵer 2 a chael 0.11697777844051095979530830215969.

$$0.11697777844051095979530830215969+0.6427876096865394^{2}+0.3420201433256687\times 0.6427876096865394=\frac{3}{4}$$

Cyfrifo 0.6427876096865394 i bŵer 2 a chael 0.41317591116653492029192554775236.

$$0.11697777844051095979530830215969+0.41317591116653492029192554775236+0.3420201433256687\times 0.6427876096865394=\frac{3}{4}$$

Adio 0.11697777844051095979530830215969 a 0.41317591116653492029192554775236 i gael 0.53015368960704588008723384991205.

$$0.53015368960704588008723384991205+0.3420201433256687\times 0.6427876096865394=\frac{3}{4}$$

Lluosi 0.3420201433256687 a 0.6427876096865394 i gael 0.21984631039295419598585689389678.

$$0.53015368960704588008723384991205+0.21984631039295419598585689389678=\frac{3}{4}$$

Adio 0.53015368960704588008723384991205 a 0.21984631039295419598585689389678 i gael 0.75000000000000007607309074380883.

$$0.75000000000000007607309074380883=\frac{3}{4}$$

Troswch y rhif degol 0.75000000000000007607309074380883 i’r ffracsiwn \frac{75000000000000007607309074380883}{10000000000}. Lleihau'r ffracsiwn \frac{75000000000000007607309074380883}{10000000000} i'r graddau lleiaf posib drwy dynnu a chanslo allan 1.

$$\frac{75000000000000007607309074380883}{100000000000000000000000000000000}=\frac{3}{4}$$

Lluosrif lleiaf cyffredin 100000000000000000000000000000000 a 4 yw 100000000000000000000000000000000. Troswch \frac{75000000000000007607309074380883}{100000000000000000000000000000000} a \frac{3}{4} yn ffracsiynau gyda’r enwadur 100000000000000000000000000000000.

$$\frac{75000000000000007607309074380883}{100000000000000000000000000000000}=\frac{75000000000000000000000000000000}{100000000000000000000000000000000}$$

Cymharu \frac{75000000000000007607309074380883}{100000000000000000000000000000000} gyda \frac{75000000000000000000000000000000}{100000000000000000000000000000000}.

$$\text{false}$$