1.

COS 39*SEC 51-TAN 51*COT39

Answer»

Aɴsᴡᴇʀ :-

ᴄᴏsᴇᴄ39 × sᴇᴄ51 - ᴛᴀɴ51 × ᴄᴏᴛ39

= = > ᴄᴏsᴇᴄ (90-51) × sᴇᴄ51 - ᴛᴀɴ51 × ᴄᴏᴛ (90-39)

= = > sᴇᴄ²51 -ᴛᴀɴ²51

= = > 1

Hᴏᴘᴇ ɪᴛ ʜᴇʟᴘs..!



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