sin 47 sec 43 +cos 43 cosec 47 -x cos^2 45=0
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sec43=cosec47, sin47×cosec47 =1
cosec47=sec43, sec43×cos43=1
cos45=1/√2 , cos^2 45 = 1/2
1 + 1 -x(1/2)=0
x=4
cosec47=sec43, sec43×cos43=1
cos45=1/√2 , cos^2 45 = 1/2
1 + 1 -x(1/2)=0
x=4
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