what is 3 sin^2 (theta 1+ theta 2) - 4 cos^2 (theta 1 + theta 2),, if sin^2 theta 1 + sin ^2 theta 2 =1 and theta 1 greater than or equal to 0 degress and theta 2 is less than or equal to 90 degress
HINT:
use sin^2 theta 1 + cos^2 theta 2 =1 identity to get the relation between theta 1 and 2.
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