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OpenStudy (anonymous):
find exact value of expression without a calculator. 1-tan^2 65 +csc^2 25
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OpenStudy (amoodarya):
csc^2 25=1+cot^2 25
OpenStudy (amoodarya):
OpenStudy (amoodarya):
25+65=90 so sin(25)=cos(65) or tan(25)=cot(65) ...
OpenStudy (anonymous):
Replace and you find that your expressions boils down to 2
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