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Cos theta =sin105*+cos105*

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Cos theta =sin105*+cos105*

    • Posted by Sumit Kumar 7 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Keshav Bindal 7 years, 3 months ago

    RHS = sin(90+15) + cos(90+15) = sin90.cos15 + cos90.sin15 + cos90.cos15 - sin90.sin15 = cos15 + 0 + 0 - sin15 = cos(45-30) - sin(45-30) = cos45.cos30 + sin45.sin30 - sin45.cos30 + cos45.sin30 = √3/2√2 + 1/2√2 - √3/2√2 + 1/2√2 = 1/√2 = cos 45° therefore theta = 45

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