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CBSE Class 10 Answered

Page 410 Qstn 31 Cos4 θ – sin4θ =
Asked by miniprasad | 23 Oct, 2018, 09:58: PM
answered-by-expert Expert Answer
begin mathsize 18px style cos to the power of 4 straight theta space minus space sin to the power of 4 straight theta
straight L. straight H. straight S.
equals open parentheses sin squared straight theta close parentheses squared minus open parentheses cos squared straight theta close parentheses squared
equals open parentheses sin squared straight theta plus cos squared straight theta close parentheses open parentheses sin squared straight theta minus cos squared straight theta close parentheses
equals open parentheses sin squared straight theta minus cos squared straight theta close parentheses
now space you space can space sub comma
sin squared straight theta equals 1 minus cos squared straight theta space space space space or space space space space space cos squared straight theta equals 1 minus sin squared straight theta space

end style
Answered by Arun | 24 Oct, 2018, 10:22: AM
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