trigonometry - Proving $a\cos x+b\sin x=\sqrt{a^2+b^2}\cos(x-\alpha)$ - Mathematics Stack Exchange
![Example 23 - If A = [cos sin -sin cos], prove An - Class 12](https://d77da31580fbc8944c00-52b01ccbcfe56047120eec75d9cb2cbd.ssl.cf6.rackcdn.com/aad32890-8a76-482b-9d0c-8d86e04eaea1/slide74.jpg "Example 23 - If A = [cos sin -sin cos], prove An - Class 12")
Example 23 - If A = [cos sin -sin cos], prove An - Class 12
![If `x=a sin theta+b cos theta and y=a cos theta -b sin theta, \" prove that \" x^(2)+y^(2)=a^(2)+ - YouTube](https://i.ytimg.com/vi/crDoy60J2Oc/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGGUgZShlMA8=&rs=AOn4CLBpuZoIOasEZym5TI5nsrrOqh-a6Q "If `x=a sin theta+b cos theta and y=a cos theta -b sin theta, \\" prove that \\" x^(2)+y^(2)=a^(2)+ - YouTube")
If `x=a sin theta+b cos theta and y=a cos theta -b sin theta, \" prove that \" x^(2)+y^(2)=a^(2)+ - YouTube
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![Ex 3.3, 12 (MCQ) - If A = [cos a -sin a sin a cos a], then A + A' = I](https://d77da31580fbc8944c00-52b01ccbcfe56047120eec75d9cb2cbd.ssl.cf6.rackcdn.com/516a294a-c6cd-4b32-b98a-23cd61dd1ebc/slide47.jpg "Ex 3.3, 12 (MCQ) - If A = [cos a -sin a sin a cos a], then A + A' = I")
Ex 3.3, 12 (MCQ) - If A = [cos a -sin a sin a cos a], then A + A' = I
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