In my calculus 3 class, my professr is talked about the derivation of an equation. However, I feel confused about how can |a|^2*|b|^2*cos^2 equal to (1-cos^2).The topic is about corss product.the above equation is on the fifth row of the submitted image. a"61 = 7notice: (a,b)²là= (cb,+azb₂+9363)22.6 = <9263-αzbz, a361-ab3; 91b2-azb₁>81² = 1212.1612-9²²² -arb-a3b3-2 abrazb3-2015, axb3[a⋅ of² = Fal² · 1612 - a s1sT-газагыZса22 22tallok -ca.syarea of pasadogram with= |a1²² 101²/6/² {05² = 1a 161² sint(1-605-6)

The fifth line is:∣a∣2∣b∣2−∣a∣2∣b∣2cos2(θ)Taking out common ∣a∣2∣b∣2, we…

a " 61 = 7 notice: (a,b)² là = (cb,+azb₂+9363) 2 2.6 = <9263-αzbz, a361-ab3; 91b2-azb₁> 81² = 1212.1612-9²²² -arb-a3b3-2 abrazb3-2015, axb3 [a⋅ of² = Fal² · 1612 - a s 1s T -газагы Z са 22 22 tallok -ca.sy area of pasadogram with = |a1²² 101²/6/² {05² = 1a 161² sint (1-605-6)

a " 61 = 7 notice: (a,b)² là = (cb,+azb₂+9363) 2 2.6 = <9263-αzbz, a361-ab3; 91b2-azb₁> 81² = 1212.1612-9²²² -arb-a3b3-2 abrazb3-2015, axb3 [a⋅ of² = Fal² · 1612 - a s 1s T -газагы Z са 22 22 tallok -ca.sy area of pasadogram with = |a1²² 101²/6/² {05² = 1a 161² sint (1-605-6)

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter1: Fundamental Concepts Of Algebra

Section1.4: Fractional Expressions

Problem 72E

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