sin²∝+cos²∝=1
1-sin²∝=cos²∝
sin²16°+cos²16°-sin²60°=1-sin²60°=cos²60°=0.5²=0.25
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sin²∝+cos²∝=1
1-sin²∝=cos²∝
sin²16°+cos²16°-sin²60°=1-sin²60°=cos²60°=0.5²=0.25