Trigonometry and the CAST System Grade 11 University Chapter 5 Review 5:27:12

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Very good lesson, however, In your last example I would leave the hypotenuse as √97 and rationalize the denominators:

sin = 9/√97, =9√97/√97*√97 = 9√97/97

cos = 4/√97, =4√97/√97*√97 = 4√97/97

 just leaves those pesky decimals out of the fractions.

LunarDrift