Solution: ⇒ cos^2 17 sin^2 17 We know cos 2 θ = cos^2 θ sin^2 θ ⇒ cos 2 × 17 ⇒ cos 34 ⇒ 0.829 ...

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General Solution of Trigonometric Equation

cos 217 - sin...

Question

${cos}^{2} 17 - {sin}^{2} 17$

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Solution

Solution:
$\Rightarrow c o s^{2} 17 - s i n^{2} 17$
We know
$c o s 2 θ = c o s^{2} θ - s i n^{2} θ$
$\Rightarrow c o s 2 \times 17$
$\Rightarrow c o s 34$
$\Rightarrow 0.829$

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\frac{(\sin^{2} 73 ° + \sin^{2} 17 °)}{(\cos^{2} 28 ° + \cos^{2} 62 °)} = 1 .

{cos}^{2} 17 - {sin}^{2} 73 =

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