Question
Simplify: sin 780° sin 480° + cos 120° sin
30°Solution
sin 780°sin 480° + cos 120° sin 30° sin (360° x 2 + 60° ) sin (360° + 120° ) + cos (90° + 30° ) sin30° sin 60° sin 120° - sin 30° sin 30° = [√ 3/2] sin (90° + 30° ) [1/2] [1/2] - = [√3/2] cos 30° - 1/4 = [√ 3/2] [√ 3/2] - 1/4 = 3/4-1/4 = 2/4 = 1/2
In a family, I is sister of G. L is father-in-law of N. N is mother of G. H is daughter of G’s mother. K is the only son of L. How is I related to L?
How is S related to Q?
Read the directions carefully and answer the following questions.
If,
‘X * Y’ means X is father of Y,
‘X # Y’ means X is ...
How is H related to L?
How is E related to D?
How is L related to N?
R is the mother of T and V is the son of D. G is the brother of R. If T is the sister of V, how is D related to G?
How is Y related to R?
N has only two daughters U and P. P is married to O. O is father of S. U is married to V. B is daughter-in-law of P. How is S related to N?
How is K related to I?
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