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(Solved): 13. (three marks) Which expression is equivalent to sin2+cos2+tan2 ? a. csc2 b. cos2 ...


13. (three marks) Which expression is equivalent to \( \sin ^{2} \theta+\cos ^{2} \theta+\tan ^{2} \theta \) ? a. \( \csc ^{2

13. (three marks) Which expression is equivalent to ? a. b. c. d. 4. (ten marks) Prove each trigonometric identity. a) b) c)


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13) sin2?+cos2?+tan2?We know that sin2?+cos2?=1So, .Apply pythagorean identity.1+tan2(?)=sec2?Hence the correct option is C
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