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ICSE Class X Mid-term 2020 : Mathematics

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Ruby Peter
Bishop Cotton Girls' School (BCGS), Bangalore

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CISCE VIRTUAL LEARNING SERIES LESSON: MATHEMATICS TRIGONOMETRIC IDENTITIES (SESSION 2) October 19th, 2020 Response to Questions posed by students during the live Lesson: S.No. 1. Questions Answers 1 cos A Prove that 1+cos A = sinA 1+cosA . Yes you may. 1 This sum is proved by taking LHS. How will we prove the sum from the RHS? Prove that 1+ = RHS = 1+ 1+ 2 = (1+ )2 1 2 = (1+ )2 (1+ )(1 ) = (1+ )(1+ ) 1 = 1+ LHS 2. Prove that When proving an identity, it is advisable to start 4 2 = 4 + 2 . from one side and prove equal to the other side. Can we prove this identity by transferring a term from LHS to RHS or RHS to LHS? Follow the rule for all sums. 4 2 = 4 + 2 LHS= 2 ( 2 1) = (1 + 2 ) 2 = 2 + 4 = 4 + 2 = RHS Proved

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