Step-by-step explanation:
1) 1 + cos 60°
⇒1 + cos ( 90°-30°)
⇒1 + sin 30°
⇒1 +
⇒
2) 1 - cos 60°
⇒1 - cos ( 90°-30°)
⇒1 - sin 30°
⇒1 -
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Step-by-step explanation:
1) 1 + cos 60°
⇒1 + cos ( 90°-30°)
⇒1 + sin 30°
⇒1 +
⇒
2) 1 - cos 60°
⇒1 - cos ( 90°-30°)
⇒1 - sin 30°
⇒1 -
⇒