Verify that the equation is an identity: sin (0-4) -Cos 0 nd the exact value of each expression. tan 15°

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A: Given: u=5i+j, v=4i-3j We know that if a= xi+yj+zk then a=x2+y2+z2

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A: in 2nd quadrant sin is positive and cos is negative.

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A: answer is in next step