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If cos A = 2/5, find …

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If cos A = 2/5, find the value of 4 + 4 tan2 A.

    • Posted by Sahil Bhati 6 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 3 answers

    Shreyanka Das 6 years, 11 months ago

    CosA =2/5=b/h P= √h²-b² =√5²-2² =√25-4=√21 Now, tan²A=(√21)²/2² =21/4 According to question, 4+4×21/4=4+21=25 So the right answer is 25.... Hope it helps you a lot....

    0Thank You

    Madhu Singh 6 years, 11 months ago

    25

    0Thank You

    Anjali Kumari? 6 years, 11 months ago

    25

    2Thank You

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