Math  /  Trigonometry

QuestionQuestion 1
There are many trig identities. They allow you to solve (trig) equations by hand, and are helpful with calculus.
Below is (the left side of) one trig identity. Using the reading in textbook sections 7.1[3,7.2Cl37.1{ }^{[3}, 7.2 \mathrm{Cl}^{3}, and 7.3 (or other links below), identify this formula and type the other side of the identity in the empty box. cos(x)cos(y)sin(y)sin(x)=\cos (x) \cos (y)-\sin (y) \sin (x)=

Studdy Solution
Write down the complete identity:
The complete trigonometric identity is:
cos(x)cos(y)sin(y)sin(x)=cos(x+y) \cos(x) \cos(y) - \sin(y) \sin(x) = \cos(x + y)
The other side of the identity is cos(x+y)\boxed{\cos(x + y)}.

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