Zane is a dangerous fellow who likes to go rock climbing in active volcanoes. One time, when he was 20 meters below the edge of
a volcano, he heard some rumbling, so he decided to climb up out of there as quickly as he could. He managed to climb up 4 meters each second and get out of the volcano safely.
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Answer:
See the verification below.
Step-by-step explanation:
Starting expression:
Extract from the expression on the left of the equal sign the common factor "sin(x)":
Now use the Pythagorean trigonometric identity: to replace the expression in between square brackets with "1":
Therefore we have verified the identity