(1-sin45+sin30) (1+cos45+cos60)
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it can be written as
(1+sin30 - sin45)(1+sin30 + sin 45)
(1+sin30)^2- (sin45}^2
(3/2)^2-(1/2)
(1+sin30 - sin45)(1+sin30 + sin 45)
(1+sin30)^2- (sin45}^2
(3/2)^2-(1/2)
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