Same chapter1 markDifficulty: Easy
The value of sin2θ + cos2θ is:
Trigonometric Identities
2 marksDifficulty: Easy
Evaluate: sin 30° · cos 60° + cos 30° · sin 60°.
Original Khojo Papers practice question — not from a past board paper.
Answer
1
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Substituting the standard values gives (1/2)(1/2) + (√3/2)(√3/2) = 1/4 + 3/4 = 1. (The expression is sin(30° + 60°) = sin 90°.)
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Prove that (sec A − tan A)(sec A + tan A) = 1.
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