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Prove that- √2+√2+√2+2cos8theta=2cos theta

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Prove that- √2+√2+√2+2cos8theta=2cos theta

Posted by Pratham Mishra 7 years, 5 months ago

CBSE > Class 11 > Mathematics

2 answers

H!Mαη$Hμ Ұαδαυ ✔️ 7 years, 5 months ago

Listen i will represent theta by ¢and...... you must know that (cos2¢=2cos^2¢-1) ,,,,,Solving LHS... ,√2+√2+√2+2cos8¢...... ,√2+√2+√2(1+cos8¢)..... ,√2+√2+√2(2cos^2 4¢).....by applying identity.... ,√2+√2+2cos4¢....... ,√2+√2(1+cos4¢)...... ,√2+√2(2cos^2 2¢)..... ,√2+2cos 2¢....... ,√2(1+cos 2¢)...... ,√2(2cos^2 ¢)..... ,2cos¢......=RHS... ,,,,,,,HENCE PROVED..

Vanisha Meena 7 years, 5 months ago

Could u send ans of ths que

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