1. Evaluate :
sin 18°
cos 72°
Answers
Answered by
2
Step-by-step explanation:
sin18 is equal to cos 90 - 72 upon cos 72
cos 72 upon cos 72 is equal to 1 is the answer
Answered by
5
Answer:
sin 18 cos 72
= sin(90- 18) cos 72
= cos 72 cos 72= cos2 72
Step-by-step explanation:
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