Class 10 Maths
ICSE Class 10 Mathematics 2022 Semester-1 Sample Paper
There are three sections in the paper. Maximum Marks are 40 and Time allowed is one and a half hours. All questions are compulsory.
Read more …ICSE Questions & Answers: Maths - Trigonometric Identities
1. Prove the standard identity sec2θ - tan2θ = 1 by using sin2θ + cos2θ = 1?
LHS = sec2θ - tan2θ
= 1/cos2θ - sin2θ/cos2θ
= (1 - sin2θ)/cos2θ
= cos2θ/cos2θ
= 1
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