ICSE Class 9 Answered
cos18-sin18
Asked by bhuvanajajimoggala0 | 20 Dec, 2023, 06:41: PM
Expert Answer
cos18-sin18 = cos(45-27) - sin(45-27)
RHS = cos45 cos27 + sin45 sin27 - sin45 cos27 + cos45sin27
Sum of first term and third term of RHS is zero because cos45 = sin45 = 1/√2
Hence we get ,
RHS = sin45 sin27 + cos45sin27 = (2/√2 ) sin27 = √2 sin27
Answered by Thiyagarajan K | 20 Dec, 2023, 08:04: PM
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