Math, asked by chaitu21, 1 year ago

cos105.cos60-sin105.sin60=

MitheshShankar: answer is -cos15

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Answered by KanikAb

Here is th solution.......

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KanikAb: yes use ASTC 180 - 165 then u willl get positive only

MitheshShankar: what is ASTC?

KanikAb: yes it is english wt u thght

KanikAb: ASTC-all sin tan cos

MitheshShankar: 180- theta comes in second quadrant

MitheshShankar: not i first

MitheshShankar: not in first*

KanikAb: cos sec is nvr negitive

MitheshShankar: that is in a different case

MitheshShankar: https://ipfs.io/ipfs/QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco/wiki/Trigonometric_functions.html

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