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  1. If
    cosα
    		 = m and
    cosα
    		= n, then (m² + n²) cos²b = ?
    cosβcosβ

    1. 1
    2. 2n²
    3. n² + 3
    4. n²
Correct Option: D

(m² + n²) cos²β

=
cos²α
 +
cos²α
cos²β =
cos²α + sin²β + cos²αcos²β
 cos²β
cos²βsin²βcos²β sin²β

= cos²α . cos²β =
sin²β + cos²β
cos²β sin²β

=
cos²α
 =
cosα
² = n²
sin²βsinβ


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