Trigonometry Question - prove cos^2 (𝛼-𝛽) + 2ab sin (𝛼-𝛽) = a^2 + b^2

in this video we are going to discuss this trigonometry question with step by step solution
if cos(𝜃-𝛼) = a , sin (𝜃-𝛽) = b prove that, cos^2 (𝛼-𝛽) + 2ab sin (𝛼-𝛽) = a^2 + b^2
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