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Sum
find the value of :
3sin2 30° + 2tan2 60° - 5cos2 45°
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Solution
3 sin2 30° + 2 tan2 60° – 5 cos2 45°
= `3(1/2)^2 +2(sqrt3)^2 – 5(1/2)^2 = (3)/(4)+6 –(5)/(2) = (3 + 24 – 10)/(4) = 4(1)/(4)`
Concept: Trigonometric Ratios of Some Special Angles
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