import { DType, Tensor } from '../../../library';
import { BackwardOp, VariableI } from '../../types';
export declare class CosBack<DTpe extends DType> implements BackwardOp<DTpe> {
    input: VariableI<DTpe>;
    constructor(input: VariableI<DTpe>);
    backward(grad: Tensor<DTpe>): void;
    delete(): void;
}
export declare class ACosBack<DTpe extends DType> implements BackwardOp<DTpe> {
    input: VariableI<DTpe>;
    constructor(input: VariableI<DTpe>);
    backward(grad: Tensor<DTpe>): void;
    delete(): void;
}
export declare class CosHBack<DTpe extends DType> implements BackwardOp<DTpe> {
    input: VariableI<DTpe>;
    constructor(input: VariableI<DTpe>);
    backward(grad: Tensor<DTpe>): void;
    delete(): void;
}
export declare class ACosHBack<DTpe extends DType> implements BackwardOp<DTpe> {
    input: VariableI<DTpe>;
    constructor(input: VariableI<DTpe>);
    backward(grad: Tensor<DTpe>): void;
    delete(): void;
}