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21. (a) Prove the following identity: sin (x + g) + cos (x + g) = cos x. (b) Solve 4(cosx)2 + 3cosx 1 :

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21. (a) Prove the following identity: sin (x + g) + cos (x + g) = cos x. (b) Solve 4(cosx)2 + 3cosx 1 : 0 for 0 S x S 360. (c) The shadow of a tower standing on level ground is found to be 40m longer when the Sun's altitude is 300 than when it is 60". Find the height of the tower Tower

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