If 2A-3- 0- find the value of cos 3A-

cot^2 A = 3 cot A = √(3) cot A = cot 30 A = 30^∘ Now, cos 3A = cos 90 = 0 ...

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Range of Trigonometric Ratios from 0 to 90 Degrees

If 2A-3= 0,...

Question

If ${cot}^{2} A - 3 = 0$ , find the value of $cos 3 A$ .

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Solution

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{cot}^{2} A - 3 = 0

cos 3 A

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0^{\circ} \leq A \leq 90^{\circ}

c o s 3 A .

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cos 3 A = 45^{o}

Find the value of $\frac{c o s^{3} A - c o s 3 A}{c o s A}$ + $\frac{s i n^{3} A - s i n 3 A}{s i n A}$

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