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Mathematics
Value of 1+cos56°+cos58°-cos66° is
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Q. Value of $1+cos56^{\circ}+cos58^{\circ}-cos66^{\circ}$ is
Odisha JEE
Odisha JEE 2009
Trigonometric Functions
A
$2sin28^{\circ}\,cos29^{\circ}\,sin33^{\circ}$
B
$4cos28^{\circ}\,sin29^{\circ}\,sin33^{\circ}$
C
$4cos28^{\circ}\,cos29^{\circ}\,cos33^{\circ}$
D
$2cos28^{\circ}\,sin29^{\circ}\,sin33^{\circ}$
Solution:
Correct answer is (b) $4cos28^{\circ}\,sin29^{\circ}\,sin33^{\circ}$