COS 39*SEC 51-TAN 51*COT39
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Aɴsᴡᴇʀ :-
ᴄᴏsᴇᴄ39 × sᴇᴄ51 - ᴛᴀɴ51 × ᴄᴏᴛ39
= = > ᴄᴏsᴇᴄ (90-51) × sᴇᴄ51 - ᴛᴀɴ51 × ᴄᴏᴛ (90-39)
= = > sᴇᴄ²51 -ᴛᴀɴ²51
= = > 1
Hᴏᴘᴇ ɪᴛ ʜᴇʟᴘs..!
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