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Stella [2.4K]
Answer:
90
Step-by-step explanation:
that's a right angle
Algebraically, that would be expressed as:
Answer:
Identity is verified.
Step-by-step explanation:
We have to verify the identity 
To prove any identity we always prove one side(either left hand side or right hand side) of the equation equal to the other side.
In this identity we take the left hand side first

(as we know cos(a+b) = cosa×cosb-sina×sinb)


= - sinx ( Right hand side)
Hence identity is proved.
Answer:
My answer would be y=2x+1
Step-by-step explanation: