Exercise 61 Page 576

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Geogebra classic

a Follow the instructions you are given in the book.

b Recall the definitions of the sine and the cosine of an angle.

c What can you say about the sum of the squared cosine and the squared sine looking at the table?

d Rewrite your conjecture from the previous part using algebraic expressions.

e Substitute appropriate ratios for the sine and cosine, and then simplify.

a See solution.

b See solution.

c In a right triangle the sum of the squared cosine and the squared sine of an acute angle is equal to 1.

d (cos X)^2+(sin X)^2=1

e See solution.

Practice makes perfect

Trigonometric Ratios of Acute Angles Level 1 exercises - Trigonometric Ratios of Acute Angles Level 2 exercises - Trigonometric Ratios of Acute Angles Level 3 exercises - Trigonometric Ratios of Acute Angles

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Exercise 61 Page 576

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