Question

Prove that tan [pie/4+a]+tan[pie/4-a]=2sec2a​

Answer 1

Answer:

Sources of Surface Water Pollution:  

Sewage: Emptying the drains and sewers in fresh water bodies causes water pollution. The problem is severe in cities.

Industrial Effluents: Industrial wastes containing toxic chemicals, acids, alkalis, metallic salts, phenols,...

Synthetic Detergents: Synthetic detergents used in washing and cleaning produce foam and pollute water.

Agrochemicals: Agrochemicals like fertilizers (containing nitrates and phosphates) and pesticides (insecticides,.

Step-by-step explanation:

Answer 2

here is your answer gnsdtc❤️❤️☺️❤️❤️