ᴡʀɪᴛᴇ ᴀʟʟ ᴛʜᴇ ᴛʀɪɢᴏɴᴏᴍᴇᴛʀɪᴄ ɪᴅᴇɴᴛɪᴛɪᴇs
[ ғᴏʀ ᴄʟᴀss ] .
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The followings are trigonometric identities (I am not sur)
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