Maths Core 3
Can someone help me to solve this question:
Prove that cos^2(i + 45°) - 1/2 (cos2i - sin2i) = sin^2i.
I started expanding the bits, so sin^2 cancelled out..however not sure how to continue...
Thanks in advance
Prove that cos^2(i + 45°) - 1/2 (cos2i - sin2i) = sin^2i.
I started expanding the bits, so sin^2 cancelled out..however not sure how to continue...
Thanks in advance
Original post by Johanna97
Can someone help me to solve this question:
Prove that cos^2(i + 45°) - 1/2 (cos2i - sin2i) = sin^2i.
I started expanding the bits, so sin^2 cancelled out..however not sure how to continue...
Thanks in advance
Prove that cos^2(i + 45°) - 1/2 (cos2i - sin2i) = sin^2i.
I started expanding the bits, so sin^2 cancelled out..however not sure how to continue...
Thanks in advance
I presume "i" is just the variable, and not the square root of -1.
It's not an equation to solve, it's an identity you need to show.
Starting with the left side, what did you get?
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