1.

The value of the expression 2 2 2 2 2 sin 22 sin 68 sin 63 cos63 sin27 cos 22 cos 68   °+ ° + °+ ° °  °+ °  is

Answer»

ANSWER:

sin^2 22+sin^2 68/COS^2 22+cos^2 68+sin^2 63+sin^2 27

sin^2 22+ cos^2 22/sin^2 68+cos^2 68+sin^2 63+sin^227

=1/1+1

=2

in this QUESTION you have TWO know

sinA =cos (90-A)

cosA=sin (90-A)

sin^2 A+cos^2 A=1



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