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प्रश्न
State the signs of cos4c and cos4°. Which of these two functions is greater?
उत्तर
We know that, 1c = `(180/pi)^circ`
∴ 4c = `(4 xx 180/pi)^circ`
= `(4 xx 180/22 xx 7)^circ`
= `(229 1/11)^circ`
∴ 4c lies in third quadrant.
∴ cos 4c is negative, i.e., cos 4c < 0
Also, 4° lies in the first quadrant.
∴ cos4° is positive, i.e., cos4° > 0
Hence, cos4° > cos4c.
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