The Student Room Group

Proving an identity

https://www.quora.com/profile/Bravewarrior/p-145508229
Here is the question. Can someone please maybe start me off as I'm a bit confused? Thanks!
Reply 1
Hard to start you off when it's literally a 1 line answer.
What trig identities do you know involving adding 2 squared terms to get 1?
Original post by DFranklin
Hard to start you off when it's literally a 1 line answer.
What trig identities do you know involving adding 2 squared terms to get 1?

sin squared theta + cos squared theta = 1
Original post by DFranklin
Hard to start you off when it's literally a 1 line answer.
What trig identities do you know involving adding 2 squared terms to get 1?

And thank youu 😅

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