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![Was doing cosine law with an sss triangle. I keep getting error on my ti-84 but it works fine on an online calculator. What is causing this? Thanks. : r/trigonometry Was doing cosine law with an sss triangle. I keep getting error on my ti-84 but it works fine on an online calculator. What is causing this? Thanks. : r/trigonometry](https://preview.redd.it/was-doing-cosine-law-with-an-sss-triangle-i-keep-getting-v0-qklb4lotlt191.jpg?auto=webp&s=fb1f51cc9fc12f1151ccc255cfc9499a06ec1892)