  4.2.39Question HelpFind the exact value of the given trigonometric function. Do not use a calculator.97TCOs9TCOs4(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

Question

Find the exact value of the given trigonometric function

cos             9pie

______________

4

screen shot attachment of exact problem help_outlineImage Transcriptionclose4.2.39 Question Help Find the exact value of the given trigonometric function. Do not use a calculator. 97T COs 9T COs 4 (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) fullscreen
Step 1

The value of the trigonometric function is given as

Step 2

Without using calculator, the exact value is obtained as follows. help_outlineImage Transcriptionclose97 = cos 27 cos 4 cos (27 +) cose = COS 4 - fullscreen
Step 3

Rationalize the f... help_outlineImage Transcriptionclose97T cos 4 2 1.414 2 707 0.707 or 1000 -L fullscreen

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