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Asked Sep 25, 2019
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Expert Answer

Step 1

Consider the given equation.

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(5 cos.x-4sinx(4cos.x+5 sin 41

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Step 2

Take the left end side

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= (5cos x-4 sinx)(4cos x + 5sin x 25cos2 x16sin2 x-40sin xcosx +16 cos2 x + 25 sin x-40sin xcos.x - 25(cos x+ sin' x)+16(sin' x + cos'x)

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Step 3

Formula us...

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cos xsin x1

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Math

Trigonometry

Trigonometric Ratios

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