Ɪғ sɪɴ ᴀ+sɪɴ²ᴀ=1 ᴛʜᴇɴ ᴘʀᴏᴠᴇ ᴛʜᴀᴛ ᴄᴏs²ᴀ+ᴄᴏs⁴ᴀ=1
ᴅᴏɴ'ᴛ sᴘᴀᴍ
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Ɪғ sɪɴ ᴀ+sɪɴ²ᴀ=1 ᴛʜᴇɴ ᴘʀᴏᴠᴇ ᴛʜᴀᴛ ᴄᴏs²ᴀ+ᴄᴏs⁴ᴀ=1 ᴅᴏɴ'ᴛ sᴘᴀᴍ
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