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ICSE Class 10 Answered

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(Costheta-Sintheta)(1+tantheta) =Sectheta
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2Cos^2theta-1
 
Asked by tejvarun | 15 Jun, 2017, 05:38: PM
answered-by-expert Expert Answer
begin mathsize 16px style open parentheses cosθ minus sinθ close parentheses open parentheses 1 plus tanθ close parentheses equals open parentheses cosθ minus sinθ close parentheses open parentheses 1 plus sinθ over cosθ close parentheses equals open parentheses cosθ minus sinθ close parentheses cross times fraction numerator cosθ plus sinθ over denominator cosθ end fraction equals fraction numerator cos squared straight theta minus sin squared straight theta over denominator cosθ end fraction equals fraction numerator cos squared straight theta minus open parentheses 1 minus cos squared straight theta close parentheses over denominator cosθ end fraction equals open parentheses 2 cos squared straight theta minus 1 close parentheses cross times 1 over cosθ equals secθ open parentheses 2 cos squared straight theta minus 1 close parentheses end style
Answered by Sneha shidid | 15 Jun, 2017, 06:05: PM

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